161323651 has 4 divisors (see below), whose sum is σ = 161406432. Its totient is φ = 161240872.

The previous prime is 161323621. The next prime is 161323667. The reversal of 161323651 is 156323161.

161323651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 156323161 = 317 ⋅493133.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161323651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161323601) 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, 38395 + ... + 42388.

It is an arithmetic number, because the mean of its divisors is an integer number (40351608).

Almost surely, 2^161323651 is an apocalyptic number.

161323651 is a deficient number, since it is larger than the sum of its proper divisors (82781).

161323651 is an equidigital number, since it uses as much as digits as its factorization.

161323651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82780.

The product of its digits is 3240, while the sum is 28.

The square root of 161323651 is about 12701.3247734242. The cubic root of 161323651 is about 544.3764728864.

The spelling of 161323651 in words is "one hundred sixty-one million, three hundred twenty-three thousand, six hundred fifty-one".