31323220038157 has 2 divisors, whose sum is σ = 31323220038158. Its totient is φ = 31323220038156.

The previous prime is 31323220038151. The next prime is 31323220038191. The reversal of 31323220038157 is 75183002232313.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29633586618276 + 1689633419881 = 5443674^2 + 1299859^2 .

It is an emirp because it is prime and its reverse (75183002232313) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31323220038157 is a prime.

It is a super-2 number, since 2×31323220038157² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31323220038151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15661610019078 + 15661610019079.

It is an arithmetic number, because the mean of its divisors is an integer number (15661610019079).

Almost surely, 2^{31323220038157} is an apocalyptic number.

It is an amenable number.

31323220038157 is a deficient number, since it is larger than the sum of its proper divisors (1).

31323220038157 is an equidigital number, since it uses as much as digits as its factorization.

31323220038157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 40.

The spelling of 31323220038157 in words is "thirty-one trillion, three hundred twenty-three billion, two hundred twenty million, thirty-eight thousand, one hundred fifty-seven".