161051609 has 2 divisors, whose sum is σ = 161051610. Its totient is φ = 161051608.

The previous prime is 161051599. The next prime is 161051629. The reversal of 161051609 is 906150161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134560000 + 26491609 = 11600^2 + 5147^2 .

It is a cyclic number.

It is not a de Polignac number, because 161051609 - 2⁴ = 161051593 is a prime.

It is a super-2 number, since 2×161051609² = 51875241522977762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161051629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80525804 + 80525805.

It is an arithmetic number, because the mean of its divisors is an integer number (80525805).

Almost surely, 2^161051609 is an apocalyptic number.

It is an amenable number.

161051609 is a deficient number, since it is larger than the sum of its proper divisors (1).

161051609 is an equidigital number, since it uses as much as digits as its factorization.

161051609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 161051609 is about 12690.6110569980. The cubic root of 161051609 is about 544.0703045401.

The spelling of 161051609 in words is "one hundred sixty-one million, fifty-one thousand, six hundred nine".