400224551 has 2 divisors, whose sum is σ = 400224552. Its totient is φ = 400224550.

The previous prime is 400224547. The next prime is 400224577. The reversal of 400224551 is 155422004.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400224551 - 2² = 400224547 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400224511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200112275 + 200112276.

It is an arithmetic number, because the mean of its divisors is an integer number (200112276).

Almost surely, 2^400224551 is an apocalyptic number.

400224551 is a deficient number, since it is larger than the sum of its proper divisors (1).

400224551 is an equidigital number, since it uses as much as digits as its factorization.

400224551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 400224551 is about 20005.6129873593. The cubic root of 400224551 is about 736.9441494289.

Adding to 400224551 its reverse (155422004), we get a palindrome (555646555).

The spelling of 400224551 in words is "four hundred million, two hundred twenty-four thousand, five hundred fifty-one".