31323011220031 has 4 divisors (see below), whose sum is σ = 31324329496864. Its totient is φ = 31321692943200.

The previous prime is 31323011220029. The next prime is 31323011220037. The reversal of 31323011220031 is 13002211032313.

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 31323011220031 - 2¹ = 31323011220029 is a prime.

It is a super-2 number, since 2×31323011220031² (a number of 28 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 = 31323011219984 and 31323011220011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31323011220037) 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, 659102775 + ... + 659150296.

It is an arithmetic number, because the mean of its divisors is an integer number (7831082374216).

Almost surely, 2^{31323011220031} is an apocalyptic number.

31323011220031 is a deficient number, since it is larger than the sum of its proper divisors (1318276833).

31323011220031 is a wasteful number, since it uses less digits than its factorization.

31323011220031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1318276832.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 31323011220031 its reverse (13002211032313), we get a palindrome (44325222252344).

The spelling of 31323011220031 in words is "thirty-one trillion, three hundred twenty-three billion, eleven million, two hundred twenty thousand, thirty-one".