15123881 has 2 divisors, whose sum is σ = 15123882. Its totient is φ = 15123880.

The previous prime is 15123851. The next prime is 15123893. The reversal of 15123881 is 18832151.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9554281 + 5569600 = 3091^2 + 2360^2 .

It is a cyclic number.

It is not a de Polignac number, because 15123881 - 2¹⁰ = 15122857 is a prime.

It is a super-2 number, since 2×15123881² = 457463553004322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (15123821) 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 as a sum of consecutive naturals, namely, 7561940 + 7561941.

It is an arithmetic number, because the mean of its divisors is an integer number (7561941).

Almost surely, 2^15123881 is an apocalyptic number.

It is an amenable number.

15123881 is a deficient number, since it is larger than the sum of its proper divisors (1).

15123881 is an equidigital number, since it uses as much as digits as its factorization.

15123881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1920, while the sum is 29.

The square root of 15123881 is about 3888.9434297763. The cubic root of 15123881 is about 247.2982732001.

The spelling of 15123881 in words is "fifteen million, one hundred twenty-three thousand, eight hundred eighty-one".