15081397 has 4 divisors (see below), whose sum is σ = 15968556. Its totient is φ = 14194240.

The previous prime is 15081379. The next prime is 15081401. The reversal of 15081397 is 79318051.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79318051 = 53 ⋅1496567.

It can be written as a sum of positive squares in 2 ways, for example, as 5803281 + 9278116 = 2409^2 + 3046^2 .

It is a cyclic number.

It is not a de Polignac number, because 15081397 - 2¹⁵ = 15048629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15081197) 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, 443554 + ... + 443587.

It is an arithmetic number, because the mean of its divisors is an integer number (3992139).

Almost surely, 2^15081397 is an apocalyptic number.

15081397 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

15081397 is a deficient number, since it is larger than the sum of its proper divisors (887159).

15081397 is an equidigital number, since it uses as much as digits as its factorization.

15081397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887158.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 15081397 is about 3883.4774365252. The cubic root of 15081397 is about 247.0664968727.

The spelling of 15081397 in words is "fifteen million, eighty-one thousand, three hundred ninety-seven".