401165641 has 2 divisors, whose sum is σ = 401165642. Its totient is φ = 401165640.

The previous prime is 401165629. The next prime is 401165651. The reversal of 401165641 is 146561104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 265559616 + 135606025 = 16296^2 + 11645^2 .

It is a cyclic number.

It is not a de Polignac number, because 401165641 - 2⁹ = 401165129 is a prime.

It is not a weakly prime, because it can be changed into another prime (401165651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200582820 + 200582821.

It is an arithmetic number, because the mean of its divisors is an integer number (200582821).

Almost surely, 2^401165641 is an apocalyptic number.

It is an amenable number.

401165641 is a deficient number, since it is larger than the sum of its proper divisors (1).

401165641 is an equidigital number, since it uses as much as digits as its factorization.

401165641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 401165641 is about 20029.1198258935. The cubic root of 401165641 is about 737.5213153276.

The spelling of 401165641 in words is "four hundred one million, one hundred sixty-five thousand, six hundred forty-one".