161315630 has 64 divisors (see below), whose sum is σ = 347258880. Its totient is φ = 52790400.

The previous prime is 161315593. The next prime is 161315633. The reversal of 161315630 is 36513161.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 161315630.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161315633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 170960 + ... + 171900.

It is an arithmetic number, because the mean of its divisors is an integer number (5425920).

Almost surely, 2^161315630 is an apocalyptic number.

161315630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161315630 is an abundant number, since it is smaller than the sum of its proper divisors (185943250).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161315630 is a wasteful number, since it uses less digits than its factorization.

161315630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 161315630 is about 12701.0090150350. The cubic root of 161315630 is about 544.3674506175.

Adding to 161315630 its reverse (36513161), we get a palindrome (197828791).

The spelling of 161315630 in words is "one hundred sixty-one million, three hundred fifteen thousand, six hundred thirty".