15144401981 has 2 divisors, whose sum is σ = 15144401982. Its totient is φ = 15144401980.

The previous prime is 15144401977. The next prime is 15144402001. The reversal of 15144401981 is 18910444151.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12134124025 + 3010277956 = 110155^2 + 54866^2 .

It is a cyclic number.

It is not a de Polignac number, because 15144401981 - 2² = 15144401977 is a prime.

It is a super-2 number, since 2×15144401981² (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 (15144401081) 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, 7572200990 + 7572200991.

It is an arithmetic number, because the mean of its divisors is an integer number (7572200991).

Almost surely, 2^15144401981 is an apocalyptic number.

It is an amenable number.

15144401981 is a deficient number, since it is larger than the sum of its proper divisors (1).

15144401981 is an equidigital number, since it uses as much as digits as its factorization.

15144401981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 38.

The spelling of 15144401981 in words is "fifteen billion, one hundred forty-four million, four hundred one thousand, nine hundred eighty-one".