161764651 has 4 divisors (see below), whose sum is σ = 170278600. Its totient is φ = 153250704.

The previous prime is 161764643. The next prime is 161764657. The reversal of 161764651 is 156467161.

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 161764651 - 2³ = 161764643 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161764651.

It is not an unprimeable number, because it can be changed into a prime (161764657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4256946 + ... + 4256983.

It is an arithmetic number, because the mean of its divisors is an integer number (42569650).

Almost surely, 2^161764651 is an apocalyptic number.

161764651 is a deficient number, since it is larger than the sum of its proper divisors (8513949).

161764651 is an equidigital number, since it uses as much as digits as its factorization.

161764651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8513948.

The product of its digits is 30240, while the sum is 37.

The square root of 161764651 is about 12718.6733191792. The cubic root of 161764651 is about 544.8720637892.

The spelling of 161764651 in words is "one hundred sixty-one million, seven hundred sixty-four thousand, six hundred fifty-one".