315621 has 6 divisors (see below), whose sum is σ = 455910. Its totient is φ = 210408.

The previous prime is 315617. The next prime is 315631. The reversal of 315621 is 126513.

It can be written as a sum of positive squares in only one way, i.e., 314721 + 900 = 561^2 + 30^2 .

It is not a de Polignac number, because 315621 - 2² = 315617 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 315594 and 315603.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 315621.

It is not an unprimeable number, because it can be changed into a prime (315631) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17526 + ... + 17543.

It is an arithmetic number, because the mean of its divisors is an integer number (75985).

2³¹⁵⁶²¹ is an apocalyptic number.

It is an amenable number.

315621 is a deficient number, since it is larger than the sum of its proper divisors (140289).

315621 is a wasteful number, since it uses less digits than its factorization.

315621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35075 (or 35072 counting only the distinct ones).

The product of its digits is 180, while the sum is 18.

The square root of 315621 is about 561.8015663916. The cubic root of 315621 is about 68.0856044144.

The spelling of 315621 in words is "three hundred fifteen thousand, six hundred twenty-one".