7155868231 has 4 divisors (see below), whose sum is σ = 7156752592. Its totient is φ = 7154983872.

The previous prime is 7155868199. The next prime is 7155868253. The reversal of 7155868231 is 1328685517.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1328685517 = 467 ⋅2845151.

It is a cyclic number.

It is not a de Polignac number, because 7155868231 - 2⁵ = 7155868199 is a prime.

It is a super-2 number, since 2×7155868231² (a number of 21 digits) 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 (7159868231) 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, 429930 + ... + 446263.

It is an arithmetic number, because the mean of its divisors is an integer number (1789188148).

Almost surely, 2^7155868231 is an apocalyptic number.

7155868231 is a deficient number, since it is larger than the sum of its proper divisors (884361).

7155868231 is an equidigital number, since it uses as much as digits as its factorization.

7155868231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 884360.

The product of its digits is 403200, while the sum is 46.

The square root of 7155868231 is about 84592.3650869273. The cubic root of 7155868231 is about 1927.0254259060.

The spelling of 7155868231 in words is "seven billion, one hundred fifty-five million, eight hundred sixty-eight thousand, two hundred thirty-one".