161225744 has 10 divisors (see below), whose sum is σ = 312374910. Its totient is φ = 80612864.

The previous prime is 161225723. The next prime is 161225777. The reversal of 161225744 is 447522161.

It can be written as a sum of positive squares in only one way, i.e., 99760144 + 61465600 = 9988^2 + 7840^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 161225744.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5038289 + ... + 5038320.

It is an arithmetic number, because the mean of its divisors is an integer number (31237491).

Almost surely, 2^161225744 is an apocalyptic number.

It is an amenable number.

161225744 is a deficient number, since it is larger than the sum of its proper divisors (151149166).

161225744 is a wasteful number, since it uses less digits than its factorization.

161225744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10076617 (or 10076611 counting only the distinct ones).

The product of its digits is 13440, while the sum is 32.

The square root of 161225744 is about 12697.4699842134. The cubic root of 161225744 is about 544.2663236040.

The spelling of 161225744 in words is "one hundred sixty-one million, two hundred twenty-five thousand, seven hundred forty-four".