15125531 has 4 divisors (see below), whose sum is σ = 15141000. Its totient is φ = 15110064.

The previous prime is 15125521. The next prime is 15125533. The reversal of 15125531 is 13552151.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15125531 is a prime.

It is a super-3 number, since 3×15125531³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15125497 and 15125506.

It is not an unprimeable number, because it can be changed into a prime (15125533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6161 + ... + 8258.

It is an arithmetic number, because the mean of its divisors is an integer number (3785250).

Almost surely, 2^15125531 is an apocalyptic number.

15125531 is a deficient number, since it is larger than the sum of its proper divisors (15469).

15125531 is a wasteful number, since it uses less digits than its factorization.

15125531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15468.

The product of its digits is 750, while the sum is 23.

The square root of 15125531 is about 3889.1555638724. The cubic root of 15125531 is about 247.3072662029.

Adding to 15125531 its reverse (13552151), we get a palindrome (28677682).

The spelling of 15125531 in words is "fifteen million, one hundred twenty-five thousand, five hundred thirty-one".