15490861 has 2 divisors, whose sum is σ = 15490862. Its totient is φ = 15490860.

The previous prime is 15490847. The next prime is 15490883. The reversal of 15490861 is 16809451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11055625 + 4435236 = 3325^2 + 2106^2 .

It is an emirp because it is prime and its reverse (16809451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15490861 - 2⁵ = 15490829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15490801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7745430 + 7745431.

It is an arithmetic number, because the mean of its divisors is an integer number (7745431).

Almost surely, 2^15490861 is an apocalyptic number.

It is an amenable number.

15490861 is a deficient number, since it is larger than the sum of its proper divisors (1).

15490861 is an equidigital number, since it uses as much as digits as its factorization.

15490861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 15490861 is about 3935.8431117106. The cubic root of 15490861 is about 249.2825349453.

The spelling of 15490861 in words is "fifteen million, four hundred ninety thousand, eight hundred sixty-one".