6401215071531 has 24 divisors (see below), whose sum is σ = 10660599237600. Its totient is φ = 3625466939136.

The previous prime is 6401215071521. The next prime is 6401215071551. The reversal of 6401215071531 is 1351705121046.

6401215071531 is a `hidden beast` number, since 6 + 4 + 0 + 1 + 2 + 1 + 50 + 71 + 531 = 666.

It is not a de Polignac number, because 6401215071531 - 2⁹ = 6401215071019 is a prime.

It is a super-2 number, since 2×6401215071531² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6401215071521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 449579556 + ... + 449593793.

It is an arithmetic number, because the mean of its divisors is an integer number (444191634900).

Almost surely, 2^{6401215071531} is an apocalyptic number.

6401215071531 is a deficient number, since it is larger than the sum of its proper divisors (4259384166069).

6401215071531 is a wasteful number, since it uses less digits than its factorization.

6401215071531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 899173475 (or 899173472 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The spelling of 6401215071531 in words is "six trillion, four hundred one billion, two hundred fifteen million, seventy-one thousand, five hundred thirty-one".