315721455129 has 32 divisors (see below), whose sum is σ = 493133926400. Its totient is φ = 199086809040.

The previous prime is 315721455107. The next prime is 315721455131. The reversal of 315721455129 is 921554127513.

315721455129 is a `hidden beast` number, since 3 + 1 + 5 + 72 + 1 + 4 + 551 + 29 = 666.

It is not a de Polignac number, because 315721455129 - 2¹⁵ = 315721422361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (315721455229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 163969 + ... + 811374.

It is an arithmetic number, because the mean of its divisors is an integer number (15410435200).

Almost surely, 2^315721455129 is an apocalyptic number.

It is an amenable number.

315721455129 is a deficient number, since it is larger than the sum of its proper divisors (177412471271).

315721455129 is a wasteful number, since it uses less digits than its factorization.

315721455129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976002 (or 975996 counting only the distinct ones).

The product of its digits is 378000, while the sum is 45.

The spelling of 315721455129 in words is "three hundred fifteen billion, seven hundred twenty-one million, four hundred fifty-five thousand, one hundred twenty-nine".