2155415231 has 4 divisors (see below), whose sum is σ = 2185773264. Its totient is φ = 2125057200.

The previous prime is 2155415221. The next prime is 2155415237. The reversal of 2155415231 is 1325145512.

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 2155415231 - 2²² = 2151220927 is a prime.

It is a super-2 number, since 2×2155415231² = 9291629636053566722, 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 = 2155415194 and 2155415203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155415237) 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, 15178910 + ... + 15179051.

It is an arithmetic number, because the mean of its divisors is an integer number (546443316).

Almost surely, 2^2155415231 is an apocalyptic number.

2155415231 is a deficient number, since it is larger than the sum of its proper divisors (30358033).

2155415231 is an equidigital number, since it uses as much as digits as its factorization.

2155415231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30358032.

The product of its digits is 6000, while the sum is 29.

The square root of 2155415231 is about 46426.4496919590. The cubic root of 2155415231 is about 1291.7455749190.

The spelling of 2155415231 in words is "two billion, one hundred fifty-five million, four hundred fifteen thousand, two hundred thirty-one".