31503400133 has 4 divisors (see below), whose sum is σ = 32271775788. Its totient is φ = 30735024480.

The previous prime is 31503400121. The next prime is 31503400151. The reversal of 31503400133 is 33100430513.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10448519524 + 21054880609 = 102218^2 + 145103^2 .

It is a cyclic number.

It is not a de Polignac number, because 31503400133 - 2⁶ = 31503400069 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31503400099 and 31503400108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31503400193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 384187766 + ... + 384187847.

It is an arithmetic number, because the mean of its divisors is an integer number (8067943947).

Almost surely, 2^31503400133 is an apocalyptic number.

It is an amenable number.

31503400133 is a deficient number, since it is larger than the sum of its proper divisors (768375655).

31503400133 is an equidigital number, since it uses as much as digits as its factorization.

31503400133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768375654.

The product of its (nonzero) digits is 1620, while the sum is 23.

Adding to 31503400133 its reverse (33100430513), we get a palindrome (64603830646).

The spelling of 31503400133 in words is "thirty-one billion, five hundred three million, four hundred thousand, one hundred thirty-three".