15837488981 has 2 divisors, whose sum is σ = 15837488982. Its totient is φ = 15837488980.

The previous prime is 15837488923. The next prime is 15837488999. The reversal of 15837488981 is 18988473851.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15452976100 + 384512881 = 124310^2 + 19609^2 .

It is an emirp because it is prime and its reverse (18988473851) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15837488981 is a prime.

It is a super-2 number, since 2×15837488981² (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 (15837988981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7918744490 + 7918744491.

It is an arithmetic number, because the mean of its divisors is an integer number (7918744491).

Almost surely, 2^15837488981 is an apocalyptic number.

It is an amenable number.

15837488981 is a deficient number, since it is larger than the sum of its proper divisors (1).

15837488981 is an equidigital number, since it uses as much as digits as its factorization.

15837488981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15482880, while the sum is 62.

The spelling of 15837488981 in words is "fifteen billion, eight hundred thirty-seven million, four hundred eighty-eight thousand, nine hundred eighty-one".