315112142981 has 2 divisors, whose sum is σ = 315112142982. Its totient is φ = 315112142980.

The previous prime is 315112142959. The next prime is 315112143041. The reversal of 315112142981 is 189241211513.

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., 259854238081 + 55257904900 = 509759^2 + 235070^2 .

It is a cyclic number.

It is not a de Polignac number, because 315112142981 - 2¹⁰ = 315112141957 is a prime.

It is a super-2 number, since 2×315112142981² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315112142281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157556071490 + 157556071491.

It is an arithmetic number, because the mean of its divisors is an integer number (157556071491).

Almost surely, 2^315112142981 is an apocalyptic number.

It is an amenable number.

315112142981 is a deficient number, since it is larger than the sum of its proper divisors (1).

315112142981 is an equidigital number, since it uses as much as digits as its factorization.

315112142981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 38.

The spelling of 315112142981 in words is "three hundred fifteen billion, one hundred twelve million, one hundred forty-two thousand, nine hundred eighty-one".