15121000 has 32 divisors (see below), whose sum is σ = 35385480. Its totient is φ = 6048000.

The previous prime is 15120997. The next prime is 15121003. The reversal of 15121000 is 12151.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (15120997) and next prime (15121003).

It can be written as a sum of positive squares in 4 ways, for example, as 2490084 + 12630916 = 1578^2 + 3554^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (15121003) 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 7 ways as a sum of consecutive naturals, for example, 6561 + ... + 8560.

Almost surely, 2^15121000 is an apocalyptic number.

15121000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15121000 is an abundant number, since it is smaller than the sum of its proper divisors (20264480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15121000 is a wasteful number, since it uses less digits than its factorization.

15121000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15142 (or 15128 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 10.

The square root of 15121000 is about 3888.5730030437. The cubic root of 15121000 is about 247.2825693039.

Adding to 15121000 its reverse (12151), we get a palindrome (15133151).

The spelling of 15121000 in words is "fifteen million, one hundred twenty-one thousand".