15252499981 has 2 divisors, whose sum is σ = 15252499982. Its totient is φ = 15252499980.

The previous prime is 15252499967. The next prime is 15252500051. The reversal of 15252499981 is 18999425251.

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., 14415844356 + 836655625 = 120066^2 + 28925^2 .

It is a cyclic number.

It is not a de Polignac number, because 15252499981 - 2⁵ = 15252499949 is a prime.

It is a super-2 number, since 2×15252499981² (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 (15252499181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7626249990 + 7626249991.

It is an arithmetic number, because the mean of its divisors is an integer number (7626249991).

Almost surely, 2^15252499981 is an apocalyptic number.

It is an amenable number.

15252499981 is a deficient number, since it is larger than the sum of its proper divisors (1).

15252499981 is an equidigital number, since it uses as much as digits as its factorization.

15252499981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2332800, while the sum is 55.

The spelling of 15252499981 in words is "fifteen billion, two hundred fifty-two million, four hundred ninety-nine thousand, nine hundred eighty-one".