19890917315 has 16 divisors (see below), whose sum is σ = 25479256320. Its totient is φ = 14862889440.

The previous prime is 19890917311. The next prime is 19890917327. The reversal of 19890917315 is 51371909891.

It is not a de Polignac number, because 19890917315 - 2² = 19890917311 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19890917311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1467749 + ... + 1481238.

It is an arithmetic number, because the mean of its divisors is an integer number (1592453520).

Almost surely, 2^19890917315 is an apocalyptic number.

19890917315 is a deficient number, since it is larger than the sum of its proper divisors (5588339005).

19890917315 is a wasteful number, since it uses less digits than its factorization.

19890917315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2949082.

The product of its (nonzero) digits is 612360, while the sum is 53.

The spelling of 19890917315 in words is "nineteen billion, eight hundred ninety million, nine hundred seventeen thousand, three hundred fifteen".