105171988 has 6 divisors (see below), whose sum is σ = 184050986. Its totient is φ = 52585992.

The previous prime is 105171949. The next prime is 105172003. The reversal of 105171988 is 889171501.

It can be written as a sum of positive squares in only one way, i.e., 89075844 + 16096144 = 9438^2 + 4012^2 .

It is a super-2 number, since 2×105171988² = 22122294119744288, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 105171988.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13146495 + ... + 13146502.

Almost surely, 2^105171988 is an apocalyptic number.

It is an amenable number.

105171988 is a deficient number, since it is larger than the sum of its proper divisors (78878998).

105171988 is a wasteful number, since it uses less digits than its factorization.

105171988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26293001 (or 26292999 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 40.

The square root of 105171988 is about 10255.3394873110. The cubic root of 105171988 is about 472.0268406167.

The spelling of 105171988 in words is "one hundred five million, one hundred seventy-one thousand, nine hundred eighty-eight".