401018551 has 2 divisors, whose sum is σ = 401018552. Its totient is φ = 401018550.

The previous prime is 401018539. The next prime is 401018557. The reversal of 401018551 is 155810104.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 401018551 - 2⁹ = 401018039 is a prime.

It is a super-2 number, since 2×401018551² = 321631756492279202, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401018557) 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, 200509275 + 200509276.

It is an arithmetic number, because the mean of its divisors is an integer number (200509276).

Almost surely, 2^401018551 is an apocalyptic number.

401018551 is a deficient number, since it is larger than the sum of its proper divisors (1).

401018551 is an equidigital number, since it uses as much as digits as its factorization.

401018551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 800, while the sum is 25.

The square root of 401018551 is about 20025.4475855098. The cubic root of 401018551 is about 737.4311653078.

Adding to 401018551 its reverse (155810104), we get a palindrome (556828655).

The spelling of 401018551 in words is "four hundred one million, eighteen thousand, five hundred fifty-one".