74471561 has 4 divisors (see below), whose sum is σ = 74495124. Its totient is φ = 74448000.

The previous prime is 74471513. The next prime is 74471563. The reversal of 74471561 is 16517447.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9765625 + 64705936 = 3125^2 + 8044^2 .

It is a cyclic number.

It is not a de Polignac number, because 74471561 - 2⁶ = 74471497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74471563) 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, 6140 + ... + 13661.

It is an arithmetic number, because the mean of its divisors is an integer number (18623781).

Almost surely, 2^74471561 is an apocalyptic number.

It is an amenable number.

74471561 is a deficient number, since it is larger than the sum of its proper divisors (23563).

74471561 is a wasteful number, since it uses less digits than its factorization.

74471561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23562.

The product of its digits is 23520, while the sum is 35.

The square root of 74471561 is about 8629.6906665303. The cubic root of 74471561 is about 420.7235468367.

The spelling of 74471561 in words is "seventy-four million, four hundred seventy-one thousand, five hundred sixty-one".