170671391 has 4 divisors (see below), whose sum is σ = 186186984. Its totient is φ = 155155800.

The previous prime is 170671367. The next prime is 170671393. The reversal of 170671391 is 193176071.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 193176071 = 11 ⋅17561461.

It is a cyclic number.

It is not a de Polignac number, because 170671391 - 2¹⁴ = 170655007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (170671393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7757780 + ... + 7757801.

It is an arithmetic number, because the mean of its divisors is an integer number (46546746).

Almost surely, 2^170671391 is an apocalyptic number.

170671391 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

170671391 is a deficient number, since it is larger than the sum of its proper divisors (15515593).

170671391 is a wasteful number, since it uses less digits than its factorization.

170671391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15515592.

The product of its (nonzero) digits is 7938, while the sum is 35.

The square root of 170671391 is about 13064.1261093117. The cubic root of 170671391 is about 554.6941376673.

The spelling of 170671391 in words is "one hundred seventy million, six hundred seventy-one thousand, three hundred ninety-one".