170661387 has 16 divisors (see below), whose sum is σ = 245337120. Its totient is φ = 104900352.

The previous prime is 170661377. The next prime is 170661389. The reversal of 170661387 is 783166071.

It is not a de Polignac number, because 170661387 - 2²⁶ = 103552523 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (170661389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40789 + ... + 44777.

It is an arithmetic number, because the mean of its divisors is an integer number (15333570).

Almost surely, 2^170661387 is an apocalyptic number.

170661387 is a deficient number, since it is larger than the sum of its proper divisors (74675733).

170661387 is a wasteful number, since it uses less digits than its factorization.

170661387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5102.

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 170661387 is about 13063.7432231348. The cubic root of 170661387 is about 554.6832995521.

The spelling of 170661387 in words is "one hundred seventy million, six hundred sixty-one thousand, three hundred eighty-seven".