400161001 has 2 divisors, whose sum is σ = 400161002. Its totient is φ = 400161000.

The previous prime is 400160993. The next prime is 400161007. The reversal of 400161001 is 100161004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 388050601 + 12110400 = 19699^2 + 3480^2 .

It is a cyclic number.

It is not a de Polignac number, because 400161001 - 2³ = 400160993 is a prime.

It is not a weakly prime, because it can be changed into another prime (400161007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200080500 + 200080501.

It is an arithmetic number, because the mean of its divisors is an integer number (200080501).

Almost surely, 2^400161001 is an apocalyptic number.

It is an amenable number.

400161001 is a deficient number, since it is larger than the sum of its proper divisors (1).

400161001 is an equidigital number, since it uses as much as digits as its factorization.

400161001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 400161001 is about 20004.0246200608. The cubic root of 400161001 is about 736.9051419271.

The spelling of 400161001 in words is "four hundred million, one hundred sixty-one thousand, one".