1917031862820 has 48 divisors (see below), whose sum is σ = 5376741068160. Its totient is φ = 510346415616.

The previous prime is 1917031862819. The next prime is 1917031862843. The reversal of 1917031862820 is 282681307191.

It is a super-2 number, since 2×1917031862820² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1917031862820.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26904160 + ... + 26975319.

It is an arithmetic number, because the mean of its divisors is an integer number (112015438920).

Almost surely, 2^{1917031862820} is an apocalyptic number.

1917031862820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1917031862820 is an abundant number, since it is smaller than the sum of its proper divisors (3459709205340).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1917031862820 is a wasteful number, since it uses less digits than its factorization.

1917031862820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53880084 (or 53880082 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 48.

The spelling of 1917031862820 in words is "one trillion, nine hundred seventeen billion, thirty-one million, eight hundred sixty-two thousand, eight hundred twenty".