31123303157 has 2 divisors, whose sum is σ = 31123303158. Its totient is φ = 31123303156.

The previous prime is 31123303147. The next prime is 31123303181. The reversal of 31123303157 is 75130332113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29635966801 + 1487336356 = 172151^2 + 38566^2 .

It is an emirp because it is prime and its reverse (75130332113) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31123303157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31123303147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15561651578 + 15561651579.

It is an arithmetic number, because the mean of its divisors is an integer number (15561651579).

Almost surely, 2^31123303157 is an apocalyptic number.

It is an amenable number.

31123303157 is a deficient number, since it is larger than the sum of its proper divisors (1).

31123303157 is an equidigital number, since it uses as much as digits as its factorization.

31123303157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5670, while the sum is 29.

The spelling of 31123303157 in words is "thirty-one billion, one hundred twenty-three million, three hundred three thousand, one hundred fifty-seven".