401645971 has 2 divisors, whose sum is σ = 401645972. Its totient is φ = 401645970.

The previous prime is 401645939. The next prime is 401645977. The reversal of 401645971 is 179546104.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 401645971 - 2⁵ = 401645939 is a prime.

It is a super-2 number, since 2×401645971² = 322638972041065682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 401645971.

It is not a weakly prime, because it can be changed into another prime (401645977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200822985 + 200822986.

It is an arithmetic number, because the mean of its divisors is an integer number (200822986).

Almost surely, 2^401645971 is an apocalyptic number.

401645971 is a deficient number, since it is larger than the sum of its proper divisors (1).

401645971 is an equidigital number, since it uses as much as digits as its factorization.

401645971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 401645971 is about 20041.1070303015. The cubic root of 401645971 is about 737.8155514937.

The spelling of 401645971 in words is "four hundred one million, six hundred forty-five thousand, nine hundred seventy-one".