161003140 has 12 divisors (see below), whose sum is σ = 338106636. Its totient is φ = 64401248.

The previous prime is 161003113. The next prime is 161003147. The reversal of 161003140 is 41300161.

It can be written as a sum of positive squares in 2 ways, for example, as 37748736 + 123254404 = 6144^2 + 11102^2 .

It is a super-2 number, since 2×161003140² = 51844022179719200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161003147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4025059 + ... + 4025098.

It is an arithmetic number, because the mean of its divisors is an integer number (28175553).

Almost surely, 2^161003140 is an apocalyptic number.

161003140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161003140 is an abundant number, since it is smaller than the sum of its proper divisors (177103496).

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

161003140 is a wasteful number, since it uses less digits than its factorization.

161003140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8050166 (or 8050164 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 161003140 is about 12688.7012731800. The cubic root of 161003140 is about 544.0157191608.

The spelling of 161003140 in words is "one hundred sixty-one million, three thousand, one hundred forty".