15391481 has 4 divisors (see below), whose sum is σ = 17590272. Its totient is φ = 13192692.

The previous prime is 15391471. The next prime is 15391487. The reversal of 15391481 is 18419351.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 15391481 - 2⁶ = 15391417 is a prime.

It is a super-2 number, since 2×15391481² = 473795374746722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (15391487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1099385 + ... + 1099398.

It is an arithmetic number, because the mean of its divisors is an integer number (4397568).

Almost surely, 2^15391481 is an apocalyptic number.

It is an amenable number.

15391481 is a deficient number, since it is larger than the sum of its proper divisors (2198791).

15391481 is an equidigital number, since it uses as much as digits as its factorization.

15391481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2198790.

The product of its digits is 4320, while the sum is 32.

The square root of 15391481 is about 3923.1978028134. The cubic root of 15391481 is about 248.7483088696.

The spelling of 15391481 in words is "fifteen million, three hundred ninety-one thousand, four hundred eighty-one".