15111980981 has 2 divisors, whose sum is σ = 15111980982. Its totient is φ = 15111980980.

The previous prime is 15111980977. The next prime is 15111981109. The reversal of 15111980981 is 18908911151.

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., 13056718756 + 2055262225 = 114266^2 + 45335^2 .

It is a cyclic number.

It is not a de Polignac number, because 15111980981 - 2² = 15111980977 is a prime.

It is a super-2 number, since 2×15111980981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15111983981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7555990490 + 7555990491.

It is an arithmetic number, because the mean of its divisors is an integer number (7555990491).

Almost surely, 2^15111980981 is an apocalyptic number.

It is an amenable number.

15111980981 is a deficient number, since it is larger than the sum of its proper divisors (1).

15111980981 is an equidigital number, since it uses as much as digits as its factorization.

15111980981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 44.

The spelling of 15111980981 in words is "fifteen billion, one hundred eleven million, nine hundred eighty thousand, nine hundred eighty-one".