787171231 has 12 divisors (see below), whose sum is σ = 998934120. Its totient is φ = 613379760.

The previous prime is 787171223. The next prime is 787171243. The reversal of 787171231 is 132171787.

It is not a de Polignac number, because 787171231 - 2³ = 787171223 is a prime.

It is a super-2 number, since 2×787171231² = 1239277093828110722, 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 (787171031) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 729676 + ... + 730753.

It is an arithmetic number, because the mean of its divisors is an integer number (83244510).

Almost surely, 2^787171231 is an apocalyptic number.

787171231 is a deficient number, since it is larger than the sum of its proper divisors (211762889).

787171231 is a wasteful number, since it uses less digits than its factorization.

787171231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1460454 (or 1460447 counting only the distinct ones).

The product of its digits is 16464, while the sum is 37.

The square root of 787171231 is about 28056.5719752075. The cubic root of 787171231 is about 923.3288476397.

The spelling of 787171231 in words is "seven hundred eighty-seven million, one hundred seventy-one thousand, two hundred thirty-one".