31124534521 has 2 divisors, whose sum is σ = 31124534522. Its totient is φ = 31124534520.

The previous prime is 31124534501. The next prime is 31124534527. The reversal of 31124534521 is 12543542113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20237907600 + 10886626921 = 142260^2 + 104339^2 .

It is a cyclic number.

It is not a de Polignac number, because 31124534521 - 2¹⁹ = 31124010233 is a prime.

It is not a weakly prime, because it can be changed into another prime (31124534527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15562267260 + 15562267261.

It is an arithmetic number, because the mean of its divisors is an integer number (15562267261).

Almost surely, 2^31124534521 is an apocalyptic number.

It is an amenable number.

31124534521 is a deficient number, since it is larger than the sum of its proper divisors (1).

31124534521 is an equidigital number, since it uses as much as digits as its factorization.

31124534521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14400, while the sum is 31.

The spelling of 31124534521 in words is "thirty-one billion, one hundred twenty-four million, five hundred thirty-four thousand, five hundred twenty-one".