161506799 has 2 divisors, whose sum is σ = 161506800. Its totient is φ = 161506798.

The previous prime is 161506729. The next prime is 161506801. The reversal of 161506799 is 997605161.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161506799 - 2¹⁶ = 161441263 is a prime.

It is a super-2 number, since 2×161506799² = 52168892246452802, which contains 22 as substring.

Together with 161506801, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161506729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80753399 + 80753400.

It is an arithmetic number, because the mean of its divisors is an integer number (80753400).

Almost surely, 2^161506799 is an apocalyptic number.

161506799 is a deficient number, since it is larger than the sum of its proper divisors (1).

161506799 is an equidigital number, since it uses as much as digits as its factorization.

161506799 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 102060, while the sum is 44.

The square root of 161506799 is about 12708.5325274006. The cubic root of 161506799 is about 544.5824020968.

The spelling of 161506799 in words is "one hundred sixty-one million, five hundred six thousand, seven hundred ninety-nine".