3155640431 has 4 divisors (see below), whose sum is σ = 3176538864. Its totient is φ = 3134742000.

The previous prime is 3155640421. The next prime is 3155640463. The reversal of 3155640431 is 1340465513.

3155640431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1340465513 = 31 ⋅43240823.

It is a cyclic number.

It is not a de Polignac number, because 3155640431 - 2²² = 3151446127 is a prime.

It is a super-2 number, since 2×3155640431² = 19916133059523731522, 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 (3155640401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10448990 + ... + 10449291.

It is an arithmetic number, because the mean of its divisors is an integer number (794134716).

Almost surely, 2^3155640431 is an apocalyptic number.

3155640431 is a deficient number, since it is larger than the sum of its proper divisors (20898433).

3155640431 is a wasteful number, since it uses less digits than its factorization.

3155640431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20898432.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 3155640431 is about 56175.0872807511. The cubic root of 3155640431 is about 1466.7716387046.

The spelling of 3155640431 in words is "three billion, one hundred fifty-five million, six hundred forty thousand, four hundred thirty-one".