31002020123 has 4 divisors (see below), whose sum is σ = 31015065000. Its totient is φ = 30988975248.

The previous prime is 31002020117. The next prime is 31002020129. The reversal of 31002020123 is 32102020013.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (31002020117) and next prime (31002020129).

It is a cyclic number.

It is not a de Polignac number, because 31002020123 - 2⁶ = 31002020059 is a prime.

It is a super-2 number, since 2×31002020123² (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 = 31002020098 and 31002020107.

It is not an unprimeable number, because it can be changed into a prime (31002020129) 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, 6518873 + ... + 6523626.

It is an arithmetic number, because the mean of its divisors is an integer number (7753766250).

Almost surely, 2^31002020123 is an apocalyptic number.

31002020123 is a deficient number, since it is larger than the sum of its proper divisors (13044877).

31002020123 is a wasteful number, since it uses less digits than its factorization.

31002020123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13044876.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 31002020123 its reverse (32102020013), we get a palindrome (63104040136).

The spelling of 31002020123 in words is "thirty-one billion, two million, twenty thousand, one hundred twenty-three".