401645081 has 2 divisors, whose sum is σ = 401645082. Its totient is φ = 401645080.

The previous prime is 401645059. The next prime is 401645089. The reversal of 401645081 is 180546104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 379470400 + 22174681 = 19480^2 + 4709^2 .

It is a cyclic number.

It is not a de Polignac number, because 401645081 - 2⁶ = 401645017 is a prime.

It is a super-2 number, since 2×401645081² = 322637542182993122, which contains 22 as substring.

It is equal to p_21419183 and since 401645081 and 21419183 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (401645089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200822540 + 200822541.

It is an arithmetic number, because the mean of its divisors is an integer number (200822541).

Almost surely, 2^401645081 is an apocalyptic number.

It is an amenable number.

401645081 is a deficient number, since it is larger than the sum of its proper divisors (1).

401645081 is an equidigital number, since it uses as much as digits as its factorization.

401645081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 401645081 is about 20041.0848259270. The cubic root of 401645081 is about 737.8150065226.

The spelling of 401645081 in words is "four hundred one million, six hundred forty-five thousand, eighty-one".