12561490 has 8 divisors (see below), whose sum is σ = 22610700. Its totient is φ = 5024592.

The previous prime is 12561481. The next prime is 12561491. The reversal of 12561490 is 9416521.

It can be written as a sum of positive squares in 2 ways, for example, as 11716929 + 844561 = 3423^2 + 919^2 .

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

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (12561491) 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, 628065 + ... + 628084.

Almost surely, 2^12561490 is an apocalyptic number.

12561490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12561490 is a deficient number, since it is larger than the sum of its proper divisors (10049210).

12561490 is a wasteful number, since it uses less digits than its factorization.

12561490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1256156.

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

The square root of 12561490 is about 3544.2192370112. The cubic root of 12561490 is about 232.4593677790.

The spelling of 12561490 in words is "twelve million, five hundred sixty-one thousand, four hundred ninety".