15661351 has 2 divisors, whose sum is σ = 15661352. Its totient is φ = 15661350.

The previous prime is 15661343. The next prime is 15661357. The reversal of 15661351 is 15316651.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15661351 - 2³ = 15661343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15661357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7830675 + 7830676.

It is an arithmetic number, because the mean of its divisors is an integer number (7830676).

Almost surely, 2^15661351 is an apocalyptic number.

15661351 is a deficient number, since it is larger than the sum of its proper divisors (1).

15661351 is an equidigital number, since it uses as much as digits as its factorization.

15661351 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2700, while the sum is 28.

The square root of 15661351 is about 3957.4424822099. The cubic root of 15661351 is about 250.1937218486.

The spelling of 15661351 in words is "fifteen million, six hundred sixty-one thousand, three hundred fifty-one".