171661490 has 96 divisors (see below), whose sum is σ = 418279680. Its totient is φ = 49357440.

The previous prime is 171661459. The next prime is 171661493. The reversal of 171661490 is 94166171.

171661490 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 171661490.

It is not an unprimeable number, because it can be changed into a prime (171661493) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 109331 + ... + 110889.

It is an arithmetic number, because the mean of its divisors is an integer number (4357080).

Almost surely, 2^171661490 is an apocalyptic number.

171661490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

171661490 is an abundant number, since it is smaller than the sum of its proper divisors (246618190).

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

171661490 is a wasteful number, since it uses less digits than its factorization.

171661490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1608 (or 1597 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 171661490 is about 13101.9651197826. The cubic root of 171661490 is about 555.7647008254.

The spelling of 171661490 in words is "one hundred seventy-one million, six hundred sixty-one thousand, four hundred ninety".