15481481 has 2 divisors, whose sum is σ = 15481482. Its totient is φ = 15481480.

The previous prime is 15481469. The next prime is 15481483. The reversal of 15481481 is 18418451.

It is a happy number.

15481481 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., 12313081 + 3168400 = 3509^2 + 1780^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15481481 is a prime.

It is a super-2 number, since 2×15481481² = 479352507906722, which contains 22 as substring.

Together with 15481483, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (15481483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7740740 + 7740741.

It is an arithmetic number, because the mean of its divisors is an integer number (7740741).

Almost surely, 2^15481481 is an apocalyptic number.

It is an amenable number.

15481481 is a deficient number, since it is larger than the sum of its proper divisors (1).

15481481 is an equidigital number, since it uses as much as digits as its factorization.

15481481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5120, while the sum is 32.

The square root of 15481481 is about 3934.6513187321. The cubic root of 15481481 is about 249.2322097397.

The spelling of 15481481 in words is "fifteen million, four hundred eighty-one thousand, four hundred eighty-one".