171693945 has 16 divisors (see below), whose sum is σ = 305233920. Its totient is φ = 91570032.

The previous prime is 171693923. The next prime is 171693979. The reversal of 171693945 is 549396171.

It is not a de Polignac number, because 171693945 - 2⁵ = 171693913 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 171693945.

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, 635769 + ... + 636038.

It is an arithmetic number, because the mean of its divisors is an integer number (19077120).

Almost surely, 2^171693945 is an apocalyptic number.

171693945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

171693945 is a deficient number, since it is larger than the sum of its proper divisors (133539975).

171693945 is a wasteful number, since it uses less digits than its factorization.

171693945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1271821 (or 1271815 counting only the distinct ones).

The product of its digits is 204120, while the sum is 45.

The square root of 171693945 is about 13103.2036159101. The cubic root of 171693945 is about 555.7997236422.

The spelling of 171693945 in words is "one hundred seventy-one million, six hundred ninety-three thousand, nine hundred forty-five".