31618541849 has 2 divisors, whose sum is σ = 31618541850. Its totient is φ = 31618541848.

The previous prime is 31618541803. The next prime is 31618541879. The reversal of 31618541849 is 94814581613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24427501849 + 7191040000 = 156293^2 + 84800^2 .

It is a cyclic number.

It is not a de Polignac number, because 31618541849 - 2⁸ = 31618541593 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31618541797 and 31618541806.

It is not a weakly prime, because it can be changed into another prime (31618541879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15809270924 + 15809270925.

It is an arithmetic number, because the mean of its divisors is an integer number (15809270925).

Almost surely, 2^31618541849 is an apocalyptic number.

It is an amenable number.

31618541849 is a deficient number, since it is larger than the sum of its proper divisors (1).

31618541849 is an equidigital number, since it uses as much as digits as its factorization.

31618541849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 829440, while the sum is 50.

The spelling of 31618541849 in words is "thirty-one billion, six hundred eighteen million, five hundred forty-one thousand, eight hundred forty-nine".