161238925 has 12 divisors (see below), whose sum is σ = 201918996. Its totient is φ = 127712000.

The previous prime is 161238923. The next prime is 161238943. The reversal of 161238925 is 529832161.

It can be written as a sum of positive squares in 6 ways, for example, as 8988004 + 152250921 = 2998^2 + 12339^2 .

It is not a de Polignac number, because 161238925 - 2¹ = 161238923 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161238923) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29404 + ... + 34453.

It is an arithmetic number, because the mean of its divisors is an integer number (16826583).

Almost surely, 2^161238925 is an apocalyptic number.

It is an amenable number.

161238925 is a deficient number, since it is larger than the sum of its proper divisors (40680071).

161238925 is a wasteful number, since it uses less digits than its factorization.

161238925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63968 (or 63963 counting only the distinct ones).

The product of its digits is 25920, while the sum is 37.

The square root of 161238925 is about 12697.9890140132. The cubic root of 161238925 is about 544.2811553522.

It can be divided in two parts, 161 and 238925, that added together give a triangular number (239086 = T₆₉₁).

The spelling of 161238925 in words is "one hundred sixty-one million, two hundred thirty-eight thousand, nine hundred twenty-five".