128552731 has 2 divisors, whose sum is σ = 128552732. Its totient is φ = 128552730.

The previous prime is 128552707. The next prime is 128552761. The reversal of 128552731 is 137255821.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128552731 is a prime.

It is a super-2 number, since 2×128552731² = 33051609295116722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (128552761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64276365 + 64276366.

It is an arithmetic number, because the mean of its divisors is an integer number (64276366).

Almost surely, 2^128552731 is an apocalyptic number.

128552731 is a deficient number, since it is larger than the sum of its proper divisors (1).

128552731 is an equidigital number, since it uses as much as digits as its factorization.

128552731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16800, while the sum is 34.

The square root of 128552731 is about 11338.1096748973. The cubic root of 128552731 is about 504.6927922733.

The spelling of 128552731 in words is "one hundred twenty-eight million, five hundred fifty-two thousand, seven hundred thirty-one".