400191641 has 2 divisors, whose sum is σ = 400191642. Its totient is φ = 400191640.

The previous prime is 400191629. The next prime is 400191653. The reversal of 400191641 is 146191004.

It is a balanced prime because it is at equal distance from previous prime (400191629) and next prime (400191653).

It can be written as a sum of positive squares in only one way, i.e., 200817241 + 199374400 = 14171^2 + 14120^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400191641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400191641.

It is not a weakly prime, because it can be changed into another prime (400191691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200095820 + 200095821.

It is an arithmetic number, because the mean of its divisors is an integer number (200095821).

Almost surely, 2^400191641 is an apocalyptic number.

It is an amenable number.

400191641 is a deficient number, since it is larger than the sum of its proper divisors (1).

400191641 is an equidigital number, since it uses as much as digits as its factorization.

400191641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 400191641 is about 20004.7904512894. The cubic root of 400191641 is about 736.9239495214.

The spelling of 400191641 in words is "four hundred million, one hundred ninety-one thousand, six hundred forty-one".