31445544551 has 4 divisors (see below), whose sum is σ = 31693147392. Its totient is φ = 31197941712.

The previous prime is 31445544539. The next prime is 31445544577. The reversal of 31445544551 is 15544554413.

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 31445544551 - 2³⁴ = 14265675367 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31445544499 and 31445544508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31445540551) 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, 123801230 + ... + 123801483.

It is an arithmetic number, because the mean of its divisors is an integer number (7923286848).

Almost surely, 2^31445544551 is an apocalyptic number.

31445544551 is a deficient number, since it is larger than the sum of its proper divisors (247602841).

31445544551 is a wasteful number, since it uses less digits than its factorization.

31445544551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247602840.

The product of its digits is 480000, while the sum is 41.

The spelling of 31445544551 in words is "thirty-one billion, four hundred forty-five million, five hundred forty-four thousand, five hundred fifty-one".