400553161 has 2 divisors, whose sum is σ = 400553162. Its totient is φ = 400553160.

The previous prime is 400553159. The next prime is 400553177. The reversal of 400553161 is 161355004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 264387600 + 136165561 = 16260^2 + 11669^2 .

It is a cyclic number.

It is not a de Polignac number, because 400553161 - 2¹ = 400553159 is a prime.

Together with 400553159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (400553141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200276580 + 200276581.

It is an arithmetic number, because the mean of its divisors is an integer number (200276581).

Almost surely, 2^400553161 is an apocalyptic number.

It is an amenable number.

400553161 is a deficient number, since it is larger than the sum of its proper divisors (1).

400553161 is an equidigital number, since it uses as much as digits as its factorization.

400553161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 400553161 is about 20013.8242472547. The cubic root of 400553161 is about 737.1457870415.

The spelling of 400553161 in words is "four hundred million, five hundred fifty-three thousand, one hundred sixty-one".