161310730 has 32 divisors (see below), whose sum is σ = 346270464. Its totient is φ = 52901376.

The previous prime is 161310727. The next prime is 161310761. The reversal of 161310730 is 37013161.

It is a super-2 number, since 2×161310730² = 52042303226265800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48487 + ... + 51706.

It is an arithmetic number, because the mean of its divisors is an integer number (10820952).

Almost surely, 2^161310730 is an apocalyptic number.

161310730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161310730 is an abundant number, since it is smaller than the sum of its proper divisors (184959734).

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

161310730 is a wasteful number, since it uses less digits than its factorization.

161310730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100230.

The product of its (nonzero) digits is 378, while the sum is 22.

The square root of 161310730 is about 12700.8161155101. The cubic root of 161310730 is about 544.3619387988.

Adding to 161310730 its reverse (37013161), we get a palindrome (198323891).

The spelling of 161310730 in words is "one hundred sixty-one million, three hundred ten thousand, seven hundred thirty".