251201013231 has 8 divisors (see below), whose sum is σ = 382782496384. Its totient is φ = 143543436120.

The previous prime is 251201013197. The next prime is 251201013251. The reversal of 251201013231 is 132310102152.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 251201013231 - 2³¹ = 249053529583 is a prime.

It is a super-3 number, since 3×251201013231³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 11961953011 = 251201013231 / (2 + 5 + 1 + 2 + 0 + 1 + 0 + 1 + 3 + 2 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 251201013198 and 251201013207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251201013251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5980976485 + ... + 5980976526.

It is an arithmetic number, because the mean of its divisors is an integer number (47847812048).

Almost surely, 2^251201013231 is an apocalyptic number.

251201013231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

251201013231 is a deficient number, since it is larger than the sum of its proper divisors (131581483153).

251201013231 is a wasteful number, since it uses less digits than its factorization.

251201013231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11961953021.

The product of its (nonzero) digits is 360, while the sum is 21.

Adding to 251201013231 its reverse (132310102152), we get a palindrome (383511115383).

The spelling of 251201013231 in words is "two hundred fifty-one billion, two hundred one million, thirteen thousand, two hundred thirty-one".