31031002420 has 48 divisors (see below), whose sum is σ = 71128104768. Its totient is φ = 11277826560.

The previous prime is 31031002399. The next prime is 31031002441. The reversal of 31031002420 is 2420013013.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (31031002399) and next prime (31031002441).

It is a super-2 number, since 2×31031002420² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31031002394 and 31031002403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 374407 + ... + 449713.

It is an arithmetic number, because the mean of its divisors is an integer number (1481835516).

Almost surely, 2^31031002420 is an apocalyptic number.

It is an amenable number.

31031002420 is an abundant number, since it is smaller than the sum of its proper divisors (40097102348).

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

31031002420 is a wasteful number, since it uses less digits than its factorization.

31031002420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77200 (or 77198 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 31031002420 its reverse (2420013013), we get a palindrome (33451015433).

The spelling of 31031002420 in words is "thirty-one billion, thirty-one million, two thousand, four hundred twenty".