15136381 has 8 divisors (see below), whose sum is σ = 16344440. Its totient is φ = 13934592.

The previous prime is 15136351. The next prime is 15136393. The reversal of 15136381 is 18363151.

It can be written as a sum of positive squares in 4 ways, for example, as 1512900 + 13623481 = 1230^2 + 3691^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 7-Lehmer number, since φ(15136381) divides (15136381-1)⁷.

It is a cyclic number.

It is not a de Polignac number, because 15136381 - 2⁵ = 15136349 is a prime.

It is a super-2 number, since 2×15136381² = 458220059554322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15136351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4285 + ... + 6973.

It is an arithmetic number, because the mean of its divisors is an integer number (2043055).

Almost surely, 2^15136381 is an apocalyptic number.

It is an amenable number.

15136381 is a deficient number, since it is larger than the sum of its proper divisors (1208059).

15136381 is a wasteful number, since it uses less digits than its factorization.

15136381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3135.

The product of its digits is 2160, while the sum is 28.

The square root of 15136381 is about 3890.5502181568. The cubic root of 15136381 is about 247.3663857250.

The spelling of 15136381 in words is "fifteen million, one hundred thirty-six thousand, three hundred eighty-one".