31403040023 has 4 divisors (see below), whose sum is σ = 31510217928. Its totient is φ = 31295862120.

The previous prime is 31403039971. The next prime is 31403040091. The reversal of 31403040023 is 32004030413.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32004030413 = 2137 ⋅14976149.

It is a cyclic number.

It is not a de Polignac number, because 31403040023 - 2³⁴ = 14223170839 is a prime.

It is a super-2 number, since 2×31403040023² (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 = 31403039977 and 31403040004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31403042023) 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, 53588513 + ... + 53589098.

It is an arithmetic number, because the mean of its divisors is an integer number (7877554482).

Almost surely, 2^31403040023 is an apocalyptic number.

31403040023 is a deficient number, since it is larger than the sum of its proper divisors (107177905).

31403040023 is a wasteful number, since it uses less digits than its factorization.

31403040023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107177904.

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 31403040023 its reverse (32004030413), we get a palindrome (63407070436).

The spelling of 31403040023 in words is "thirty-one billion, four hundred three million, forty thousand, twenty-three".