161171380 has 12 divisors (see below), whose sum is σ = 338459940. Its totient is φ = 64468544.

The previous prime is 161171377. The next prime is 161171383. The reversal of 161171380 is 83171161.

It is an interprime number because it is at equal distance from previous prime (161171377) and next prime (161171383).

It can be written as a sum of positive squares in 2 ways, for example, as 124277904 + 36893476 = 11148^2 + 6074^2 .

It is a super-2 number, since 2×161171380² = 51952427462208800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161171383) 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, 4029265 + ... + 4029304.

It is an arithmetic number, because the mean of its divisors is an integer number (28204995).

Almost surely, 2^161171380 is an apocalyptic number.

161171380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161171380 is an abundant number, since it is smaller than the sum of its proper divisors (177288560).

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

161171380 is a wasteful number, since it uses less digits than its factorization.

161171380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8058578 (or 8058576 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 161171380 is about 12695.3290622969. The cubic root of 161171380 is about 544.2051426784.

The spelling of 161171380 in words is "one hundred sixty-one million, one hundred seventy-one thousand, three hundred eighty".