31121100247 has 2 divisors, whose sum is σ = 31121100248. Its totient is φ = 31121100246.

The previous prime is 31121100239. The next prime is 31121100251. The reversal of 31121100247 is 74200112113.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31121100247 - 2³ = 31121100239 is a prime.

It is a super-2 number, since 2×31121100247² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31121100547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15560550123 + 15560550124.

It is an arithmetic number, because the mean of its divisors is an integer number (15560550124).

Almost surely, 2^31121100247 is an apocalyptic number.

31121100247 is a deficient number, since it is larger than the sum of its proper divisors (1).

31121100247 is an equidigital number, since it uses as much as digits as its factorization.

31121100247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 22.

The spelling of 31121100247 in words is "thirty-one billion, one hundred twenty-one million, one hundred thousand, two hundred forty-seven".