128131516 has 24 divisors (see below), whose sum is σ = 249918480. Its totient is φ = 57123072.

The previous prime is 128131477. The next prime is 128131517. The reversal of 128131516 is 615131821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128131517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48295 + ... + 50878.

It is an arithmetic number, because the mean of its divisors is an integer number (10413270).

Almost surely, 2^128131516 is an apocalyptic number.

It is an amenable number.

128131516 is a deficient number, since it is larger than the sum of its proper divisors (121786964).

128131516 is a wasteful number, since it uses less digits than its factorization.

128131516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99213 (or 99211 counting only the distinct ones).

The product of its digits is 1440, while the sum is 28.

The square root of 128131516 is about 11319.5192477419. The cubic root of 128131516 is about 504.1409648108.

The spelling of 128131516 in words is "one hundred twenty-eight million, one hundred thirty-one thousand, five hundred sixteen".