315540421 has 4 divisors (see below), whose sum is σ = 360617632. Its totient is φ = 270463212.

The previous prime is 315540419. The next prime is 315540431. The reversal of 315540421 is 124045513.

It is a happy number.

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: 124045513 = 61 ⋅2033533.

It is a cyclic number.

It is not a de Polignac number, because 315540421 - 2¹ = 315540419 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 (315540431) 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, 22538595 + ... + 22538608.

It is an arithmetic number, because the mean of its divisors is an integer number (90154408).

Almost surely, 2^315540421 is an apocalyptic number.

It is an amenable number.

315540421 is a deficient number, since it is larger than the sum of its proper divisors (45077211).

315540421 is an equidigital number, since it uses as much as digits as its factorization.

315540421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45077210.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 315540421 is about 17763.4574618794. The cubic root of 315540421 is about 680.7980976741.

Adding to 315540421 its reverse (124045513), we get a palindrome (439585934).

The spelling of 315540421 in words is "three hundred fifteen million, five hundred forty thousand, four hundred twenty-one".