161771125 has 8 divisors (see below), whose sum is σ = 201890520. Its totient is φ = 129416800.

The previous prime is 161771101. The next prime is 161771131. The reversal of 161771125 is 521177161.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5870929 + 155900196 = 2423^2 + 12486^2 .

It is not a de Polignac number, because 161771125 - 2¹¹ = 161769077 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 646960 + ... + 647209.

It is an arithmetic number, because the mean of its divisors is an integer number (25236315).

Almost surely, 2^161771125 is an apocalyptic number.

It is an amenable number.

161771125 is a deficient number, since it is larger than the sum of its proper divisors (40119395).

161771125 is an equidigital number, since it uses as much as digits as its factorization.

161771125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1294184 (or 1294174 counting only the distinct ones).

The product of its digits is 2940, while the sum is 31.

The square root of 161771125 is about 12718.9278243097. The cubic root of 161771125 is about 544.8793324861.

The spelling of 161771125 in words is "one hundred sixty-one million, seven hundred seventy-one thousand, one hundred twenty-five".