61357431 has 8 divisors (see below), whose sum is σ = 83712640. Its totient is φ = 39953592.

The previous prime is 61357427. The next prime is 61357453. The reversal of 61357431 is 13475316.

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

It is not a de Polignac number, because 61357431 - 2² = 61357427 is a prime.

It is a super-2 number, since 2×61357431² = 7529468677839522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61357421) 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, 237691 + ... + 237948.

It is an arithmetic number, because the mean of its divisors is an integer number (10464080).

Almost surely, 2^61357431 is an apocalyptic number.

61357431 is a deficient number, since it is larger than the sum of its proper divisors (22355209).

61357431 is a wasteful number, since it uses less digits than its factorization.

61357431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475685.

The product of its digits is 7560, while the sum is 30.

The square root of 61357431 is about 7833.0984291020. The cubic root of 61357431 is about 394.4170881834.

The spelling of 61357431 in words is "sixty-one million, three hundred fifty-seven thousand, four hundred thirty-one".