31143615553 has 2 divisors, whose sum is σ = 31143615554. Its totient is φ = 31143615552.

The previous prime is 31143615551. The next prime is 31143615577. The reversal of 31143615553 is 35551634113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30507163569 + 636451984 = 174663^2 + 25228^2 .

It is an emirp because it is prime and its reverse (35551634113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31143615553 - 2¹ = 31143615551 is a prime.

Together with 31143615551, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (31143615551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15571807776 + 15571807777.

It is an arithmetic number, because the mean of its divisors is an integer number (15571807777).

Almost surely, 2^31143615553 is an apocalyptic number.

It is an amenable number.

31143615553 is a deficient number, since it is larger than the sum of its proper divisors (1).

31143615553 is an equidigital number, since it uses as much as digits as its factorization.

31143615553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81000, while the sum is 37.

The spelling of 31143615553 in words is "thirty-one billion, one hundred forty-three million, six hundred fifteen thousand, five hundred fifty-three".