15981023 has 2 divisors, whose sum is σ = 15981024. Its totient is φ = 15981022.

The previous prime is 15981019. The next prime is 15981047. The reversal of 15981023 is 32018951.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15981023 - 2² = 15981019 is a prime.

It is a super-2 number, since 2×15981023² = 510786192253058, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15981013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7990511 + 7990512.

It is an arithmetic number, because the mean of its divisors is an integer number (7990512).

Almost surely, 2^15981023 is an apocalyptic number.

15981023 is a deficient number, since it is larger than the sum of its proper divisors (1).

15981023 is an equidigital number, since it uses as much as digits as its factorization.

15981023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 15981023 is about 3997.6271712104. The cubic root of 15981023 is about 251.8845475593.

Adding to 15981023 its reverse (32018951), we get a palindrome (47999974).

The spelling of 15981023 in words is "fifteen million, nine hundred eighty-one thousand, twenty-three".