161292505 has 8 divisors (see below), whose sum is σ = 211146624. Its totient is φ = 117303600.

The previous prime is 161292503. The next prime is 161292511. The reversal of 161292505 is 505292161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161292505 - 2¹ = 161292503 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161292503) 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 7 ways as a sum of consecutive naturals, for example, 1466241 + ... + 1466350.

It is an arithmetic number, because the mean of its divisors is an integer number (26393328).

Almost surely, 2^161292505 is an apocalyptic number.

It is an amenable number.

161292505 is a deficient number, since it is larger than the sum of its proper divisors (49854119).

161292505 is a wasteful number, since it uses less digits than its factorization.

161292505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2932607.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 161292505 is about 12700.0986216643. The cubic root of 161292505 is about 544.3414372281.

The spelling of 161292505 in words is "one hundred sixty-one million, two hundred ninety-two thousand, five hundred five".