315221025 has 24 divisors (see below), whose sum is σ = 595618624. Its totient is φ = 144100800.

The previous prime is 315220993. The next prime is 315221029. The reversal of 315221025 is 520122513.

It is not a de Polignac number, because 315221025 - 2⁵ = 315220993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 315220992 and 315221010.

It is not an unprimeable number, because it can be changed into a prime (315221029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 299686 + ... + 300735.

Almost surely, 2^315221025 is an apocalyptic number.

315221025 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

315221025 is a deficient number, since it is larger than the sum of its proper divisors (280397599).

315221025 is a wasteful number, since it uses less digits than its factorization.

315221025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600441 (or 600436 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 315221025 is about 17754.4649313912. The cubic root of 315221025 is about 680.5683145432.

Adding to 315221025 its reverse (520122513), we get a palindrome (835343538).

The spelling of 315221025 in words is "three hundred fifteen million, two hundred twenty-one thousand, twenty-five".