400951121 has 2 divisors, whose sum is σ = 400951122. Its totient is φ = 400951120.

The previous prime is 400951099. The next prime is 400951123. The reversal of 400951121 is 121159004.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 382632721 + 18318400 = 19561^2 + 4280^2 .

It is a cyclic number.

It is not a de Polignac number, because 400951121 - 2¹⁰ = 400950097 is a prime.

Together with 400951123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (400951123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200475560 + 200475561.

It is an arithmetic number, because the mean of its divisors is an integer number (200475561).

Almost surely, 2^400951121 is an apocalyptic number.

It is an amenable number.

400951121 is a deficient number, since it is larger than the sum of its proper divisors (1).

400951121 is an equidigital number, since it uses as much as digits as its factorization.

400951121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 400951121 is about 20023.7639069182. The cubic root of 400951121 is about 737.3898307522.

The spelling of 400951121 in words is "four hundred million, nine hundred fifty-one thousand, one hundred twenty-one".