315621289 has 4 divisors (see below), whose sum is σ = 318106624. Its totient is φ = 313135956.

The previous prime is 315621281. The next prime is 315621329. The reversal of 315621289 is 982126513.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 982126513 = 1193 ⋅823241.

It is a cyclic number.

It is not a de Polignac number, because 315621289 - 2³ = 315621281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (315621281) 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, 1242477 + ... + 1242730.

It is an arithmetic number, because the mean of its divisors is an integer number (79526656).

Almost surely, 2^315621289 is an apocalyptic number.

It is an amenable number.

315621289 is a deficient number, since it is larger than the sum of its proper divisors (2485335).

315621289 is a wasteful number, since it uses less digits than its factorization.

315621289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2485334.

The product of its digits is 25920, while the sum is 37.

The square root of 315621289 is about 17765.7335621133. The cubic root of 315621289 is about 680.8562519541.

The spelling of 315621289 in words is "three hundred fifteen million, six hundred twenty-one thousand, two hundred eighty-nine".