2605172331 has 16 divisors (see below), whose sum is σ = 3573609984. Its totient is φ = 1686920544.

The previous prime is 2605172321. The next prime is 2605172357. The reversal of 2605172331 is 1332715062.

It is not a de Polignac number, because 2605172331 - 2¹¹ = 2605170283 is a prime.

It is a super-2 number, since 2×2605172331² = 13573845748415947122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2605172321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45166 + ... + 85148.

It is an arithmetic number, because the mean of its divisors is an integer number (223350624).

Almost surely, 2^2605172331 is an apocalyptic number.

2605172331 is a deficient number, since it is larger than the sum of its proper divisors (968437653).

2605172331 is a wasteful number, since it uses less digits than its factorization.

2605172331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40610.

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

The square root of 2605172331 is about 51040.8888147532. Note that the first 4 decimals coincide. The cubic root of 2605172331 is about 1375.9800978719.

Adding to 2605172331 its reverse (1332715062), we get a palindrome (3937887393).

It can be divided in two parts, 2605 and 172331, that added together give a triangular number (174936 = T₅₉₁).

The spelling of 2605172331 in words is "two billion, six hundred five million, one hundred seventy-two thousand, three hundred thirty-one".