401997715251 has 16 divisors (see below), whose sum is σ = 590188664448. Its totient is φ = 241358014400.

The previous prime is 401997715237. The next prime is 401997715267. The reversal of 401997715251 is 152517799104.

It is a cyclic number.

It is not a de Polignac number, because 401997715251 - 2⁹ = 401997714739 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 401997715194 and 401997715203.

It is not an unprimeable number, because it can be changed into a prime (401997715211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56920530 + ... + 56927591.

It is an arithmetic number, because the mean of its divisors is an integer number (36886791528).

Almost surely, 2^401997715251 is an apocalyptic number.

401997715251 is a deficient number, since it is larger than the sum of its proper divisors (188190949197).

401997715251 is a wasteful number, since it uses less digits than its factorization.

401997715251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113848242.

The product of its (nonzero) digits is 793800, while the sum is 51.

The spelling of 401997715251 in words is "four hundred one billion, nine hundred ninety-seven million, seven hundred fifteen thousand, two hundred fifty-one".