31124042251 has 2 divisors, whose sum is σ = 31124042252. Its totient is φ = 31124042250.

The previous prime is 31124042227. The next prime is 31124042269. The reversal of 31124042251 is 15224042113.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31124042251 - 2⁵ = 31124042219 is a prime.

It is not a weakly prime, because it can be changed into another prime (31124042351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15562021125 + 15562021126.

It is an arithmetic number, because the mean of its divisors is an integer number (15562021126).

Almost surely, 2^31124042251 is an apocalyptic number.

31124042251 is a deficient number, since it is larger than the sum of its proper divisors (1).

31124042251 is an equidigital number, since it uses as much as digits as its factorization.

31124042251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 31124042251 its reverse (15224042113), we get a palindrome (46348084364).

The spelling of 31124042251 in words is "thirty-one billion, one hundred twenty-four million, forty-two thousand, two hundred fifty-one".