74721161 has 2 divisors, whose sum is σ = 74721162. Its totient is φ = 74721160.

The previous prime is 74721109. The next prime is 74721173. The reversal of 74721161 is 16112747.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70879561 + 3841600 = 8419^2 + 1960^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74721161 is a prime.

It is not a weakly prime, because it can be changed into another prime (74721061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37360580 + 37360581.

It is an arithmetic number, because the mean of its divisors is an integer number (37360581).

Almost surely, 2^74721161 is an apocalyptic number.

It is an amenable number.

74721161 is a deficient number, since it is larger than the sum of its proper divisors (1).

74721161 is an equidigital number, since it uses as much as digits as its factorization.

74721161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2352, while the sum is 29.

The square root of 74721161 is about 8644.1402695699. The cubic root of 74721161 is about 421.1930571359.

The spelling of 74721161 in words is "seventy-four million, seven hundred twenty-one thousand, one hundred sixty-one".