400191613 has 2 divisors, whose sum is σ = 400191614. Its totient is φ = 400191612.

The previous prime is 400191599. The next prime is 400191629. The reversal of 400191613 is 316191004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 319587129 + 80604484 = 17877^2 + 8978^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400191613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400191653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200095806 + 200095807.

It is an arithmetic number, because the mean of its divisors is an integer number (200095807).

Almost surely, 2^400191613 is an apocalyptic number.

It is an amenable number.

400191613 is a deficient number, since it is larger than the sum of its proper divisors (1).

400191613 is an equidigital number, since it uses as much as digits as its factorization.

400191613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 400191613 is about 20004.7897514570. The cubic root of 400191613 is about 736.9239323347.

The spelling of 400191613 in words is "four hundred million, one hundred ninety-one thousand, six hundred thirteen".