401990851 has 2 divisors, whose sum is σ = 401990852. Its totient is φ = 401990850.

The previous prime is 401990783. The next prime is 401990863. The reversal of 401990851 is 158099104.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 401990851 - 2⁷ = 401990723 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 401990851.

It is not a weakly prime, because it can be changed into another prime (401991851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200995425 + 200995426.

It is an arithmetic number, because the mean of its divisors is an integer number (200995426).

Almost surely, 2^401990851 is an apocalyptic number.

401990851 is a deficient number, since it is larger than the sum of its proper divisors (1).

401990851 is an equidigital number, since it uses as much as digits as its factorization.

401990851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 401990851 is about 20049.7094991424. The cubic root of 401990851 is about 738.0266702807.

The spelling of 401990851 in words is "four hundred one million, nine hundred ninety thousand, eight hundred fifty-one".