401958551 has 2 divisors, whose sum is σ = 401958552. Its totient is φ = 401958550.

The previous prime is 401958541. The next prime is 401958553. The reversal of 401958551 is 155859104.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 401958551 - 2¹⁰ = 401957527 is a prime.

Together with 401958553, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401958553) 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, 200979275 + 200979276.

It is an arithmetic number, because the mean of its divisors is an integer number (200979276).

Almost surely, 2^401958551 is an apocalyptic number.

401958551 is a deficient number, since it is larger than the sum of its proper divisors (1).

401958551 is an equidigital number, since it uses as much as digits as its factorization.

401958551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36000, while the sum is 38.

The square root of 401958551 is about 20048.9039850063. The cubic root of 401958551 is about 738.0069029155.

It can be divided in two parts, 40 and 1958551, that added together give a palindrome (1958591).

The spelling of 401958551 in words is "four hundred one million, nine hundred fifty-eight thousand, five hundred fifty-one".