131206251 has 8 divisors (see below), whose sum is σ = 190845504. Its totient is φ = 79518920.

The previous prime is 131206249. The next prime is 131206253. The reversal of 131206251 is 152602131.

It is an interprime number because it is at equal distance from previous prime (131206249) and next prime (131206253).

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

It is a cyclic number.

It is not a de Polignac number, because 131206251 - 2¹ = 131206249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131206253) 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, 1987941 + ... + 1988006.

It is an arithmetic number, because the mean of its divisors is an integer number (23855688).

Almost surely, 2^131206251 is an apocalyptic number.

131206251 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

131206251 is a deficient number, since it is larger than the sum of its proper divisors (59639253).

131206251 is a wasteful number, since it uses less digits than its factorization.

131206251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3975961.

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

The square root of 131206251 is about 11454.5297153572. The cubic root of 131206251 is about 508.1417069589.

Adding to 131206251 its reverse (152602131), we get a palindrome (283808382).

The spelling of 131206251 in words is "one hundred thirty-one million, two hundred six thousand, two hundred fifty-one".