15120881 has 2 divisors, whose sum is σ = 15120882. Its totient is φ = 15120880.

The previous prime is 15120877. The next prime is 15120883. The reversal of 15120881 is 18802151.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12285025 + 2835856 = 3505^2 + 1684^2 .

It is a cyclic number.

It is not a de Polignac number, because 15120881 - 2² = 15120877 is a prime.

It is a super-2 number, since 2×15120881² = 457282084432322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 15120883, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 15120881.

It is not a weakly prime, because it can be changed into another prime (15120883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7560440 + 7560441.

It is an arithmetic number, because the mean of its divisors is an integer number (7560441).

Almost surely, 2^15120881 is an apocalyptic number.

It is an amenable number.

15120881 is a deficient number, since it is larger than the sum of its proper divisors (1).

15120881 is an equidigital number, since it uses as much as digits as its factorization.

15120881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640, while the sum is 26.

The square root of 15120881 is about 3888.5577017707. The cubic root of 15120881 is about 247.2819206100.

The spelling of 15120881 in words is "fifteen million, one hundred twenty thousand, eight hundred eighty-one".