128461957 has 4 divisors (see below), whose sum is σ = 138343660. Its totient is φ = 118580256.

The previous prime is 128461943. The next prime is 128461961. The reversal of 128461957 is 759164821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18610596 + 109851361 = 4314^2 + 10481^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128461957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128461997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4940832 + ... + 4940857.

It is an arithmetic number, because the mean of its divisors is an integer number (34585915).

Almost surely, 2^128461957 is an apocalyptic number.

It is an amenable number.

128461957 is a deficient number, since it is larger than the sum of its proper divisors (9881703).

128461957 is an equidigital number, since it uses as much as digits as its factorization.

128461957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9881702.

The product of its digits is 120960, while the sum is 43.

The square root of 128461957 is about 11334.1059197451. The cubic root of 128461957 is about 504.5739726247.

The spelling of 128461957 in words is "one hundred twenty-eight million, four hundred sixty-one thousand, nine hundred fifty-seven".