15432781531 has 2 divisors, whose sum is σ = 15432781532. Its totient is φ = 15432781530.

The previous prime is 15432781519. The next prime is 15432781537. The reversal of 15432781531 is 13518723451.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15432781531 - 2⁹ = 15432781019 is a prime.

It is a super-2 number, since 2×15432781531² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15432781537) 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 as a sum of consecutive naturals, namely, 7716390765 + 7716390766.

It is an arithmetic number, because the mean of its divisors is an integer number (7716390766).

Almost surely, 2^15432781531 is an apocalyptic number.

15432781531 is a deficient number, since it is larger than the sum of its proper divisors (1).

15432781531 is an equidigital number, since it uses as much as digits as its factorization.

15432781531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100800, while the sum is 40.

The spelling of 15432781531 in words is "fifteen billion, four hundred thirty-two million, seven hundred eighty-one thousand, five hundred thirty-one".