315445021 has 8 divisors (see below), whose sum is σ = 323906688. Its totient is φ = 307020000.

The previous prime is 315444991. The next prime is 315445027. The reversal of 315445021 is 120544513.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-315445021 is a prime.

It is a super-2 number, since 2×315445021² = 199011122547380882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (315445027) 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, 8746 + ... + 26596.

It is an arithmetic number, because the mean of its divisors is an integer number (40488336).

Almost surely, 2^315445021 is an apocalyptic number.

It is an amenable number.

315445021 is a deficient number, since it is larger than the sum of its proper divisors (8461667).

315445021 is a wasteful number, since it uses less digits than its factorization.

315445021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18323.

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

The square root of 315445021 is about 17760.7719708351. The cubic root of 315445021 is about 680.7294802791.

Adding to 315445021 its reverse (120544513), we get a palindrome (435989534).

The spelling of 315445021 in words is "three hundred fifteen million, four hundred forty-five thousand, twenty-one".