400951081 has 2 divisors, whose sum is σ = 400951082. Its totient is φ = 400951080.

The previous prime is 400951073. The next prime is 400951099. The reversal of 400951081 is 180159004.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210511081 + 190440000 = 14509^2 + 13800^2 .

It is a cyclic number.

It is not a de Polignac number, because 400951081 - 2³ = 400951073 is a prime.

It is a super-2 number, since 2×400951081² = 321523538710137122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (400951051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200475540 + 200475541.

It is an arithmetic number, because the mean of its divisors is an integer number (200475541).

Almost surely, 2^400951081 is an apocalyptic number.

It is an amenable number.

400951081 is a deficient number, since it is larger than the sum of its proper divisors (1).

400951081 is an equidigital number, since it uses as much as digits as its factorization.

400951081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 400951081 is about 20023.7629081050. The cubic root of 400951081 is about 737.3898062308.

The spelling of 400951081 in words is "four hundred million, nine hundred fifty-one thousand, eighty-one".