401330551 has 2 divisors, whose sum is σ = 401330552. Its totient is φ = 401330550.

The previous prime is 401330497. The next prime is 401330563. The reversal of 401330551 is 155033104.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 401330551 - 2¹³ = 401322359 is a prime.

It is a super-2 number, since 2×401330551² = 322132422331927202, which contains 22 as substring.

It is equal to p_21403228 and since 401330551 and 21403228 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401330851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200665275 + 200665276.

It is an arithmetic number, because the mean of its divisors is an integer number (200665276).

Almost surely, 2^401330551 is an apocalyptic number.

401330551 is a deficient number, since it is larger than the sum of its proper divisors (1).

401330551 is an equidigital number, since it uses as much as digits as its factorization.

401330551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 401330551 is about 20033.2361589435. The cubic root of 401330551 is about 737.6223608525.

Adding to 401330551 its reverse (155033104), we get a palindrome (556363655).

The spelling of 401330551 in words is "four hundred one million, three hundred thirty thousand, five hundred fifty-one".