551443971631 has 4 divisors (see below), whose sum is σ = 630221681872. Its totient is φ = 472666261392.

The previous prime is 551443971607. The next prime is 551443971653. The reversal of 551443971631 is 136179344155.

551443971631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 551443971631 - 2¹⁹ = 551443447343 is a prime.

It is a super-2 number, since 2×551443971631² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551443971691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39388855110 + ... + 39388855123.

It is an arithmetic number, because the mean of its divisors is an integer number (157555420468).

Almost surely, 2^551443971631 is an apocalyptic number.

551443971631 is a deficient number, since it is larger than the sum of its proper divisors (78777710241).

551443971631 is an equidigital number, since it uses as much as digits as its factorization.

551443971631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78777710240.

The product of its digits is 1360800, while the sum is 49.

The spelling of 551443971631 in words is "five hundred fifty-one billion, four hundred forty-three million, nine hundred seventy-one thousand, six hundred thirty-one".