161027691 has 16 divisors (see below), whose sum is σ = 242300160. Its totient is φ = 94226720.

The previous prime is 161027681. The next prime is 161027693. The reversal of 161027691 is 196720161.

161027691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 161027691 - 2²⁷ = 26809963 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (161027693) 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, 83175 + ... + 85088.

It is an arithmetic number, because the mean of its divisors is an integer number (15143760).

Almost surely, 2^161027691 is an apocalyptic number.

161027691 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

161027691 is a deficient number, since it is larger than the sum of its proper divisors (81272469).

161027691 is a wasteful number, since it uses less digits than its factorization.

161027691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168306.

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 161027691 is about 12689.6686717975. The cubic root of 161027691 is about 544.0433696590.

The spelling of 161027691 in words is "one hundred sixty-one million, twenty-seven thousand, six hundred ninety-one".