31220233031 has 4 divisors (see below), whose sum is σ = 33621789432. Its totient is φ = 28818676632.

The previous prime is 31220233013. The next prime is 31220233063. The reversal of 31220233031 is 13033202213.

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 31220233031 - 2³⁴ = 14040363847 is a prime.

It is a super-2 number, since 2×31220233031² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31220232994 and 31220233012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31220233531) 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, 1200778181 + ... + 1200778206.

It is an arithmetic number, because the mean of its divisors is an integer number (8405447358).

Almost surely, 2^31220233031 is an apocalyptic number.

31220233031 is a deficient number, since it is larger than the sum of its proper divisors (2401556401).

31220233031 is a wasteful number, since it uses less digits than its factorization.

31220233031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2401556400.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 31220233031 its reverse (13033202213), we get a palindrome (44253435244).

The spelling of 31220233031 in words is "thirty-one billion, two hundred twenty million, two hundred thirty-three thousand, thirty-one".