15481399 has 2 divisors, whose sum is σ = 15481400. Its totient is φ = 15481398.

The previous prime is 15481391. The next prime is 15481421. The reversal of 15481399 is 99318451.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15481399 - 2³ = 15481391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15481391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7740699 + 7740700.

It is an arithmetic number, because the mean of its divisors is an integer number (7740700).

Almost surely, 2^15481399 is an apocalyptic number.

15481399 is a deficient number, since it is larger than the sum of its proper divisors (1).

15481399 is an equidigital number, since it uses as much as digits as its factorization.

15481399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 40.

The square root of 15481399 is about 3934.6408984811. The cubic root of 15481399 is about 249.2317697070.

The spelling of 15481399 in words is "fifteen million, four hundred eighty-one thousand, three hundred ninety-nine".