169920971 has 16 divisors (see below), whose sum is σ = 196162560. Its totient is φ = 145565280.

The previous prime is 169920953. The next prime is 169920973. The reversal of 169920971 is 179029961.

It is a cyclic number.

It is not a de Polignac number, because 169920971 - 2²² = 165726667 is a prime.

It is not an unprimeable number, because it can be changed into a prime (169920973) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39110 + ... + 43236.

It is an arithmetic number, because the mean of its divisors is an integer number (12260160).

Almost surely, 2^169920971 is an apocalyptic number.

169920971 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

169920971 is a deficient number, since it is larger than the sum of its proper divisors (26241589).

169920971 is a wasteful number, since it uses less digits than its factorization.

169920971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4354.

The product of its (nonzero) digits is 61236, while the sum is 44.

The square root of 169920971 is about 13035.3738343018. The cubic root of 169920971 is about 553.8799704774.

The spelling of 169920971 in words is "one hundred sixty-nine million, nine hundred twenty thousand, nine hundred seventy-one".