15191881 has 2 divisors, whose sum is σ = 15191882. Its totient is φ = 15191880.

The previous prime is 15191879. The next prime is 15191893. The reversal of 15191881 is 18819151.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11424400 + 3767481 = 3380^2 + 1941^2 .

It is a cyclic number.

It is not a de Polignac number, because 15191881 - 2¹ = 15191879 is a prime.

It is a super-2 number, since 2×15191881² = 461586496636322, which contains 22 as substring.

Together with 15191879, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (15191861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7595940 + 7595941.

It is an arithmetic number, because the mean of its divisors is an integer number (7595941).

Almost surely, 2^15191881 is an apocalyptic number.

It is an amenable number.

15191881 is a deficient number, since it is larger than the sum of its proper divisors (1).

15191881 is an equidigital number, since it uses as much as digits as its factorization.

15191881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 34.

The square root of 15191881 is about 3897.6763590632. The cubic root of 15191881 is about 247.6683533010.

The spelling of 15191881 in words is "fifteen million, one hundred ninety-one thousand, eight hundred eighty-one".