161058691 has 2 divisors, whose sum is σ = 161058692. Its totient is φ = 161058690.

The previous prime is 161058683. The next prime is 161058757. The reversal of 161058691 is 196850161.

161058691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (196850161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161058691 - 2³ = 161058683 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161058691.

It is not a weakly prime, because it can be changed into another prime (161058661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80529345 + 80529346.

It is an arithmetic number, because the mean of its divisors is an integer number (80529346).

Almost surely, 2^161058691 is an apocalyptic number.

161058691 is a deficient number, since it is larger than the sum of its proper divisors (1).

161058691 is an equidigital number, since it uses as much as digits as its factorization.

161058691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 161058691 is about 12690.8900791079. The cubic root of 161058691 is about 544.0782793117.

The spelling of 161058691 in words is "one hundred sixty-one million, fifty-eight thousand, six hundred ninety-one".