401512981 has 2 divisors, whose sum is σ = 401512982. Its totient is φ = 401512980.

The previous prime is 401512939. The next prime is 401513003. The reversal of 401512981 is 189215104.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 375041956 + 26471025 = 19366^2 + 5145^2 .

It is a cyclic number.

It is not a de Polignac number, because 401512981 - 2²⁷ = 267295253 is a prime.

It is a super-2 number, since 2×401512981² = 322425347823012722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401512901) 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 as a sum of consecutive naturals, namely, 200756490 + 200756491.

It is an arithmetic number, because the mean of its divisors is an integer number (200756491).

Almost surely, 2^401512981 is an apocalyptic number.

It is an amenable number.

401512981 is a deficient number, since it is larger than the sum of its proper divisors (1).

401512981 is an equidigital number, since it uses as much as digits as its factorization.

401512981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 31.

The square root of 401512981 is about 20037.7888251174. The cubic root of 401512981 is about 737.7341091879.

The spelling of 401512981 in words is "four hundred one million, five hundred twelve thousand, nine hundred eighty-one".