401782081 has 2 divisors, whose sum is σ = 401782082. Its totient is φ = 401782080.

The previous prime is 401782057. The next prime is 401782093. The reversal of 401782081 is 180287104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 401000625 + 781456 = 20025^2 + 884^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401782081 is a prime.

It is a super-2 number, since 2×401782081² = 322857681225381122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (401782181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200891040 + 200891041.

It is an arithmetic number, because the mean of its divisors is an integer number (200891041).

Almost surely, 2^401782081 is an apocalyptic number.

It is an amenable number.

401782081 is a deficient number, since it is larger than the sum of its proper divisors (1).

401782081 is an equidigital number, since it uses as much as digits as its factorization.

401782081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 401782081 is about 20044.5025131581. The cubic root of 401782081 is about 737.8988858563.

The spelling of 401782081 in words is "four hundred one million, seven hundred eighty-two thousand, eighty-one".