15154981 has 2 divisors, whose sum is σ = 15154982. Its totient is φ = 15154980.

The previous prime is 15154961. The next prime is 15154987. The reversal of 15154981 is 18945151.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9054081 + 6100900 = 3009^2 + 2470^2 .

It is an emirp because it is prime and its reverse (18945151) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15154981 - 2¹⁵ = 15122213 is a prime.

It is a super-2 number, since 2×15154981² = 459346898220722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15154987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7577490 + 7577491.

It is an arithmetic number, because the mean of its divisors is an integer number (7577491).

Almost surely, 2^15154981 is an apocalyptic number.

It is an amenable number.

15154981 is a deficient number, since it is larger than the sum of its proper divisors (1).

15154981 is an equidigital number, since it uses as much as digits as its factorization.

15154981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7200, while the sum is 34.

The square root of 15154981 is about 3892.9398916500. The cubic root of 15154981 is about 247.4676677827.

The spelling of 15154981 in words is "fifteen million, one hundred fifty-four thousand, nine hundred eighty-one".