405020432251 has 16 divisors (see below), whose sum is σ = 412764232320. Its totient is φ = 397306792960.

The previous prime is 405020432249. The next prime is 405020432263. The reversal of 405020432251 is 152234020504.

It is not a de Polignac number, because 405020432251 - 2¹ = 405020432249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405020432291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90383931 + ... + 90388411.

It is an arithmetic number, because the mean of its divisors is an integer number (25797764520).

Almost surely, 2^405020432251 is an apocalyptic number.

405020432251 is a deficient number, since it is larger than the sum of its proper divisors (7743800069).

405020432251 is a wasteful number, since it uses less digits than its factorization.

405020432251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7466.

The product of its (nonzero) digits is 9600, while the sum is 28.

Adding to 405020432251 its reverse (152234020504), we get a palindrome (557254452755).

The spelling of 405020432251 in words is "four hundred five billion, twenty million, four hundred thirty-two thousand, two hundred fifty-one".