31551032442 has 8 divisors (see below), whose sum is σ = 63102064896. Its totient is φ = 10517010812.

The previous prime is 31551032431. The next prime is 31551032449. The reversal of 31551032442 is 24423015513.

It is a sphenic number, since it is the product of 3 distinct primes.

31551032442 is an admirable number.

It is a super-2 number, since 2×31551032442² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31551032449) 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, 2629252698 + ... + 2629252709.

It is an arithmetic number, because the mean of its divisors is an integer number (7887758112).

Almost surely, 2^31551032442 is an apocalyptic number.

31551032442 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31551032442 is a wasteful number, since it uses less digits than its factorization.

31551032442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5258505412.

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 31551032442 its reverse (24423015513), we get a palindrome (55974047955).

The spelling of 31551032442 in words is "thirty-one billion, five hundred fifty-one million, thirty-two thousand, four hundred forty-two".