31505223040 has 32 divisors (see below), whose sum is σ = 75317175360. Its totient is φ = 12602088960.

The previous prime is 31505223031. The next prime is 31505223047. The reversal of 31505223040 is 4032250513.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 31505222996 and 31505223014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31505223047) 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, 24612816 + ... + 24614095.

It is an arithmetic number, because the mean of its divisors is an integer number (2353661730).

Almost surely, 2^31505223040 is an apocalyptic number.

It is an amenable number.

31505223040 is an abundant number, since it is smaller than the sum of its proper divisors (43811952320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31505223040 is an equidigital number, since it uses as much as digits as its factorization.

31505223040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49226930 (or 49226918 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 25.

Adding to 31505223040 its reverse (4032250513), we get a palindrome (35537473553).

The spelling of 31505223040 in words is "thirty-one billion, five hundred five million, two hundred twenty-three thousand, forty".