15287121 has 6 divisors (see below), whose sum is σ = 22081410. Its totient is φ = 10191408.

The previous prime is 15287113. The next prime is 15287159. The reversal of 15287121 is 12178251.

It can be written as a sum of positive squares in only one way, i.e., 9235521 + 6051600 = 3039^2 + 2460^2 .

It is not a de Polignac number, because 15287121 - 2³ = 15287113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15287101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 849276 + ... + 849293.

It is an arithmetic number, because the mean of its divisors is an integer number (3680235).

Almost surely, 2^15287121 is an apocalyptic number.

It is an amenable number.

15287121 is a deficient number, since it is larger than the sum of its proper divisors (6794289).

15287121 is a wasteful number, since it uses less digits than its factorization.

15287121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1698575 (or 1698572 counting only the distinct ones).

The product of its digits is 1120, while the sum is 27.

The square root of 15287121 is about 3909.8748061799. The cubic root of 15287121 is about 248.1848312128.

It can be divided in two parts, 1528 and 7121, that added together give a square (8649 = 93²).

The spelling of 15287121 in words is "fifteen million, two hundred eighty-seven thousand, one hundred twenty-one".