128610731 has 2 divisors, whose sum is σ = 128610732. Its totient is φ = 128610730.

The previous prime is 128610719. The next prime is 128610739. The reversal of 128610731 is 137016821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128610731 - 2⁶ = 128610667 is a prime.

It is a super-2 number, since 2×128610731² = 33081440256708722, 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 = 128610694 and 128610703.

It is not a weakly prime, because it can be changed into another prime (128610739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64305365 + 64305366.

It is an arithmetic number, because the mean of its divisors is an integer number (64305366).

Almost surely, 2^128610731 is an apocalyptic number.

128610731 is a deficient number, since it is larger than the sum of its proper divisors (1).

128610731 is an equidigital number, since it uses as much as digits as its factorization.

128610731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 128610731 is about 11340.6671320518. The cubic root of 128610731 is about 504.7686827412.

The spelling of 128610731 in words is "one hundred twenty-eight million, six hundred ten thousand, seven hundred thirty-one".