315545145520421 has 4 divisors (see below), whose sum is σ = 315739088451072. Its totient is φ = 315351202589772.

The previous prime is 315545145520411. The next prime is 315545145520433. The reversal of 315545145520421 is 124025541545513.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-315545145520421 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 (315545145520411) 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, 96971462885 + ... + 96971466138.

It is an arithmetic number, because the mean of its divisors is an integer number (78934772112768).

Almost surely, 2^{315545145520421} is an apocalyptic number.

It is an amenable number.

315545145520421 is a deficient number, since it is larger than the sum of its proper divisors (193942930651).

315545145520421 is a wasteful number, since it uses less digits than its factorization.

315545145520421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193942930650.

The product of its (nonzero) digits is 2400000, while the sum is 47.

The spelling of 315545145520421 in words is "three hundred fifteen trillion, five hundred forty-five billion, one hundred forty-five million, five hundred twenty thousand, four hundred twenty-one".