189131257965 has 64 divisors (see below), whose sum is σ = 347173263360. Its totient is φ = 87147290880.

The previous prime is 189131257907. The next prime is 189131258009. The reversal of 189131257965 is 569752131981.

189131257965 is a nontrivial binomial coefficient, being equal to C(615031, 2).

It is not a de Polignac number, because 189131257965 - 2⁶ = 189131257901 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1 + ... + 615030.

It is an arithmetic number, because the mean of its divisors is an integer number (5424582240).

Almost surely, 2^189131257965 is an apocalyptic number.

189131257965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

189131257965 is the 615030-th triangular number.

It is an amenable number.

189131257965 is a deficient number, since it is larger than the sum of its proper divisors (158042005395).

189131257965 is a wasteful number, since it uses less digits than its factorization.

189131257965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615154.

The product of its digits is 4082400, while the sum is 57.

The spelling of 189131257965 in words is "one hundred eighty-nine billion, one hundred thirty-one million, two hundred fifty-seven thousand, nine hundred sixty-five".