15199999981 has 4 divisors (see below), whose sum is σ = 16000000000. Its totient is φ = 14399999964.

The previous prime is 15199999963. The next prime is 15199999993. The reversal of 15199999981 is 18999999151.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 15199999981 - 2¹⁷ = 15199868909 is a prime.

It is a super-2 number, since 2×15199999981² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15199999981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15199999951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 399999981 + ... + 400000018.

It is an arithmetic number, because the mean of its divisors is an integer number (4000000000).

Almost surely, 2^15199999981 is an apocalyptic number.

It is an amenable number.

15199999981 is a deficient number, since it is larger than the sum of its proper divisors (800000019).

15199999981 is an equidigital number, since it uses as much as digits as its factorization.

15199999981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800000018.

The product of its digits is 21257640, while the sum is 70.

The spelling of 15199999981 in words is "fifteen billion, one hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred eighty-one".