161505494 has 16 divisors (see below), whose sum is σ = 253186560. Its totient is φ = 77121000.

The previous prime is 161505473. The next prime is 161505497. The reversal of 161505494 is 494505161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161505497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31619 + ... + 36369.

It is an arithmetic number, because the mean of its divisors is an integer number (15824160).

Almost surely, 2^161505494 is an apocalyptic number.

161505494 is a deficient number, since it is larger than the sum of its proper divisors (91681066).

161505494 is a wasteful number, since it uses less digits than its factorization.

161505494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5515.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 161505494 is about 12708.4811838394. The cubic root of 161505494 is about 544.5809353228.

The spelling of 161505494 in words is "one hundred sixty-one million, five hundred five thousand, four hundred ninety-four".