15481009 has 2 divisors, whose sum is σ = 15481010. Its totient is φ = 15481008.

The previous prime is 15480979. The next prime is 15481021. The reversal of 15481009 is 90018451.

It is a happy number.

15481009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9090225 + 6390784 = 3015^2 + 2528^2 .

It is a cyclic number.

It is not a de Polignac number, because 15481009 - 2¹¹ = 15478961 is a prime.

It is not a weakly prime, because it can be changed into another prime (15488009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7740504 + 7740505.

It is an arithmetic number, because the mean of its divisors is an integer number (7740505).

Almost surely, 2^15481009 is an apocalyptic number.

It is an amenable number.

15481009 is a deficient number, since it is larger than the sum of its proper divisors (1).

15481009 is an equidigital number, since it uses as much as digits as its factorization.

15481009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 15481009 is about 3934.5913383730. The cubic root of 15481009 is about 249.2296768469.

The spelling of 15481009 in words is "fifteen million, four hundred eighty-one thousand, nine".