161530140 has 24 divisors (see below), whose sum is σ = 452284560. Its totient is φ = 43074688.

The previous prime is 161530133. The next prime is 161530147. The reversal of 161530140 is 41035161.

It is an interprime number because it is at equal distance from previous prime (161530133) and next prime (161530147).

It is a super-2 number, since 2×161530140² = 52183972256839200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161530147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1346025 + ... + 1346144.

It is an arithmetic number, because the mean of its divisors is an integer number (18845190).

Almost surely, 2^161530140 is an apocalyptic number.

161530140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161530140 is an abundant number, since it is smaller than the sum of its proper divisors (290754420).

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

161530140 is a wasteful number, since it uses less digits than its factorization.

161530140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2692181 (or 2692179 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 161530140 is about 12709.4508142563. The cubic root of 161530140 is about 544.6086352248.

The spelling of 161530140 in words is "one hundred sixty-one million, five hundred thirty thousand, one hundred forty".