31020030431 has 4 divisors (see below), whose sum is σ = 33406186632. Its totient is φ = 28633874232.

The previous prime is 31020030421. The next prime is 31020030449. The reversal of 31020030431 is 13403002013.

It is a happy number.

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 31020030431 - 2¹⁰ = 31020029407 is a prime.

It is a super-2 number, since 2×31020030431² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31020030421) 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, 1193078081 + ... + 1193078106.

It is an arithmetic number, because the mean of its divisors is an integer number (8351546658).

Almost surely, 2^31020030431 is an apocalyptic number.

31020030431 is a deficient number, since it is larger than the sum of its proper divisors (2386156201).

31020030431 is a wasteful number, since it uses less digits than its factorization.

31020030431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2386156200.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 31020030431 its reverse (13403002013), we get a palindrome (44423032444).

The spelling of 31020030431 in words is "thirty-one billion, twenty million, thirty thousand, four hundred thirty-one".