15961313 has 2 divisors, whose sum is σ = 15961314. Its totient is φ = 15961312.

The previous prime is 15961303. The next prime is 15961357. The reversal of 15961313 is 31316951.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13162384 + 2798929 = 3628^2 + 1673^2 .

It is a cyclic number.

It is not a de Polignac number, because 15961313 - 2¹⁰ = 15960289 is a prime.

It is not a weakly prime, because it can be changed into another prime (15961303) 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, 7980656 + 7980657.

It is an arithmetic number, because the mean of its divisors is an integer number (7980657).

Almost surely, 2^15961313 is an apocalyptic number.

It is an amenable number.

15961313 is a deficient number, since it is larger than the sum of its proper divisors (1).

15961313 is an equidigital number, since it uses as much as digits as its factorization.

15961313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2430, while the sum is 29.

The square root of 15961313 is about 3995.1611982497. The cubic root of 15961313 is about 251.7809520456.

The spelling of 15961313 in words is "fifteen million, nine hundred sixty-one thousand, three hundred thirteen".