16315711381 has 2 divisors, whose sum is σ = 16315711382. Its totient is φ = 16315711380.

The previous prime is 16315711343. The next prime is 16315711403. The reversal of 16315711381 is 18311751361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11528316900 + 4787394481 = 107370^2 + 69191^2 .

It is a cyclic number.

It is not a de Polignac number, because 16315711381 - 2¹⁹ = 16315187093 is a prime.

It is a super-2 number, since 2×16315711381² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16315711381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16315718381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8157855690 + 8157855691.

It is an arithmetic number, because the mean of its divisors is an integer number (8157855691).

Almost surely, 2^16315711381 is an apocalyptic number.

It is an amenable number.

16315711381 is a deficient number, since it is larger than the sum of its proper divisors (1).

16315711381 is an equidigital number, since it uses as much as digits as its factorization.

16315711381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 37.

The spelling of 16315711381 in words is "sixteen billion, three hundred fifteen million, seven hundred eleven thousand, three hundred eighty-one".