878431031 has 2 divisors, whose sum is σ = 878431032. Its totient is φ = 878431030.

The previous prime is 878431003. The next prime is 878431051. The reversal of 878431031 is 130134878.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-878431031 is a prime.

It is a super-2 number, since 2×878431031² = 1543282152447445922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 878430982 and 878431000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (878431051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 439215515 + 439215516.

It is an arithmetic number, because the mean of its divisors is an integer number (439215516).

Almost surely, 2^878431031 is an apocalyptic number.

878431031 is a deficient number, since it is larger than the sum of its proper divisors (1).

878431031 is an equidigital number, since it uses as much as digits as its factorization.

878431031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 878431031 is about 29638.3371834521. The cubic root of 878431031 is about 957.7141182759.

The spelling of 878431031 in words is "eight hundred seventy-eight million, four hundred thirty-one thousand, thirty-one".