15428981 has 2 divisors, whose sum is σ = 15428982. Its totient is φ = 15428980.

The previous prime is 15428971. The next prime is 15428993. The reversal of 15428981 is 18982451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14945956 + 483025 = 3866^2 + 695^2 .

It is a cyclic number.

It is not a de Polignac number, because 15428981 - 2²² = 11234677 is a prime.

It is a super-2 number, since 2×15428981² = 476106909396722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15428921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7714490 + 7714491.

It is an arithmetic number, because the mean of its divisors is an integer number (7714491).

Almost surely, 2^15428981 is an apocalyptic number.

It is an amenable number.

15428981 is a deficient number, since it is larger than the sum of its proper divisors (1).

15428981 is an equidigital number, since it uses as much as digits as its factorization.

15428981 is an evil number, because the sum of its binary digits is even.

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

The square root of 15428981 is about 3927.9741597928. The cubic root of 15428981 is about 248.9501628725.

The spelling of 15428981 in words is "fifteen million, four hundred twenty-eight thousand, nine hundred eighty-one".