31197980243 has 2 divisors, whose sum is σ = 31197980244. Its totient is φ = 31197980242.

The previous prime is 31197980179. The next prime is 31197980249. The reversal of 31197980243 is 34208979113.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31197980243 - 2⁶ = 31197980179 is a prime.

It is not a weakly prime, because it can be changed into another prime (31197980249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15598990121 + 15598990122.

It is an arithmetic number, because the mean of its divisors is an integer number (15598990122).

Almost surely, 2^31197980243 is an apocalyptic number.

31197980243 is a deficient number, since it is larger than the sum of its proper divisors (1).

31197980243 is an equidigital number, since it uses as much as digits as its factorization.

31197980243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 47.

The spelling of 31197980243 in words is "thirty-one billion, one hundred ninety-seven million, nine hundred eighty thousand, two hundred forty-three".