61251431 has 4 divisors (see below), whose sum is σ = 61401600. Its totient is φ = 61101264.

The previous prime is 61251409. The next prime is 61251433. The reversal of 61251431 is 13415216.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61251431 - 2²² = 57057127 is a prime.

It is a super-2 number, since 2×61251431² = 7503475599095522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61251397 and 61251406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61251433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74471 + ... + 75288.

It is an arithmetic number, because the mean of its divisors is an integer number (15350400).

Almost surely, 2^61251431 is an apocalyptic number.

61251431 is a deficient number, since it is larger than the sum of its proper divisors (150169).

61251431 is a wasteful number, since it uses less digits than its factorization.

61251431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150168.

The product of its digits is 720, while the sum is 23.

The square root of 61251431 is about 7826.3293439517. The cubic root of 61251431 is about 394.1898279613.

Adding to 61251431 its reverse (13415216), we get a palindrome (74666647).

The spelling of 61251431 in words is "sixty-one million, two hundred fifty-one thousand, four hundred thirty-one".