315721653 has 8 divisors (see below), whose sum is σ = 453343968. Its totient is φ = 194290224.

The previous prime is 315721643. The next prime is 315721669. The reversal of 315721653 is 356127513.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 315721653 - 2⁶ = 315721589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (315721633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4047675 + ... + 4047752.

It is an arithmetic number, because the mean of its divisors is an integer number (56667996).

Almost surely, 2^315721653 is an apocalyptic number.

It is an amenable number.

315721653 is a deficient number, since it is larger than the sum of its proper divisors (137622315).

315721653 is a wasteful number, since it uses less digits than its factorization.

315721653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8095443.

The product of its digits is 18900, while the sum is 33.

The square root of 315721653 is about 17768.5579887621. The cubic root of 315721653 is about 680.9284125016.

The spelling of 315721653 in words is "three hundred fifteen million, seven hundred twenty-one thousand, six hundred fifty-three".