31628403553 has 4 divisors (see below), whose sum is σ = 31629322900. Its totient is φ = 31627484208.

The previous prime is 31628403551. The next prime is 31628403623. The reversal of 31628403553 is 35530482613.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35530482613 = 17 ⋅2090028389.

It can be written as a sum of positive squares in 2 ways, for example, as 9241361424 + 22387042129 = 96132^2 + 149623^2 .

It is a cyclic number.

It is not a de Polignac number, because 31628403553 - 2¹ = 31628403551 is a prime.

It is a super-2 number, since 2×31628403553² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31628403551) 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, 405978 + ... + 477571.

It is an arithmetic number, because the mean of its divisors is an integer number (7907330725).

Almost surely, 2^31628403553 is an apocalyptic number.

It is an amenable number.

31628403553 is a deficient number, since it is larger than the sum of its proper divisors (919347).

31628403553 is an equidigital number, since it uses as much as digits as its factorization.

31628403553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919346.

The product of its (nonzero) digits is 259200, while the sum is 40.

The spelling of 31628403553 in words is "thirty-one billion, six hundred twenty-eight million, four hundred three thousand, five hundred fifty-three".