991954170 has 48 divisors (see below), whose sum is σ = 2582503560. Its totient is φ = 264170112.

The previous prime is 991954163. The next prime is 991954231. The reversal of 991954170 is 71459199.

991954170 is a `hidden beast` number, since 99 + 19 + 541 + 7 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 615089601 + 376864569 = 24801^2 + 19413^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64816 + ... + 78644.

Almost surely, 2^991954170 is an apocalyptic number.

991954170 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

991954170 is an abundant number, since it is smaller than the sum of its proper divisors (1590549390).

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

991954170 is a wasteful number, since it uses less digits than its factorization.

991954170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14639 (or 14636 counting only the distinct ones).

The product of its (nonzero) digits is 102060, while the sum is 45.

The square root of 991954170 is about 31495.3039356663. The cubic root of 991954170 is about 997.3108315219.

The spelling of 991954170 in words is "nine hundred ninety-one million, nine hundred fifty-four thousand, one hundred seventy".