4155691 has 4 divisors (see below), whose sum is σ = 4165984. Its totient is φ = 4145400.

The previous prime is 4155673. The next prime is 4155703. The reversal of 4155691 is 1965514.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 4155691 - 2⁵ = 4155659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4155611) 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, 4515 + ... + 5356.

It is an arithmetic number, because the mean of its divisors is an integer number (1041496).

Almost surely, 2^4155691 is an apocalyptic number.

4155691 is a deficient number, since it is larger than the sum of its proper divisors (10293).

4155691 is an equidigital number, since it uses as much as digits as its factorization.

4155691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10292.

The product of its digits is 5400, while the sum is 31.

The square root of 4155691 is about 2038.5512012211. The cubic root of 4155691 is about 160.7734813285.

The spelling of 4155691 in words is "four million, one hundred fifty-five thousand, six hundred ninety-one".