31724061553 has 12 divisors (see below), whose sum is σ = 33743741980. Its totient is φ = 29802257856.

The previous prime is 31724061487. The next prime is 31724061571. The reversal of 31724061553 is 35516042713.

It can be written as a sum of positive squares in 6 ways, for example, as 5344779664 + 26379281889 = 73108^2 + 162417^2 .

It is not a de Polignac number, because 31724061553 - 2⁹ = 31724061041 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31724061053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 478638 + ... + 540871.

Almost surely, 2^31724061553 is an apocalyptic number.

It is an amenable number.

31724061553 is a deficient number, since it is larger than the sum of its proper divisors (2019680427).

31724061553 is a wasteful number, since it uses less digits than its factorization.

31724061553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1019604 (or 1019575 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 37.

The spelling of 31724061553 in words is "thirty-one billion, seven hundred twenty-four million, sixty-one thousand, five hundred fifty-three".