315516551 has 4 divisors (see below), whose sum is σ = 360590352. Its totient is φ = 270442752.

The previous prime is 315516541. The next prime is 315516557. The reversal of 315516551 is 155615513.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155615513 = 127 ⋅1225319.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-315516551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (315516557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22536890 + ... + 22536903.

It is an arithmetic number, because the mean of its divisors is an integer number (90147588).

Almost surely, 2^315516551 is an apocalyptic number.

315516551 is a deficient number, since it is larger than the sum of its proper divisors (45073801).

315516551 is an equidigital number, since it uses as much as digits as its factorization.

315516551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45073800.

The product of its digits is 11250, while the sum is 32.

The square root of 315516551 is about 17762.7855642070. The cubic root of 315516551 is about 680.7809302376.

The spelling of 315516551 in words is "three hundred fifteen million, five hundred sixteen thousand, five hundred fifty-one".