15961357 has 2 divisors, whose sum is σ = 15961358. Its totient is φ = 15961356.

The previous prime is 15961313. The next prime is 15961367. The reversal of 15961357 is 75316951.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10666756 + 5294601 = 3266^2 + 2301^2 .

It is a cyclic number.

It is not a de Polignac number, because 15961357 - 2⁷ = 15961229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15961367) 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, 7980678 + 7980679.

It is an arithmetic number, because the mean of its divisors is an integer number (7980679).

Almost surely, 2^15961357 is an apocalyptic number.

It is an amenable number.

15961357 is a deficient number, since it is larger than the sum of its proper divisors (1).

15961357 is an equidigital number, since it uses as much as digits as its factorization.

15961357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28350, while the sum is 37.

The square root of 15961357 is about 3995.1667049073. The cubic root of 15961357 is about 251.7811834040.

It can be divided in two parts, 159 and 61357, that added together give a palindrome (61516).

The spelling of 15961357 in words is "fifteen million, nine hundred sixty-one thousand, three hundred fifty-seven".