74197561 has 2 divisors, whose sum is σ = 74197562. Its totient is φ = 74197560.

The previous prime is 74197553. The next prime is 74197567. The reversal of 74197561 is 16579147.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38675961 + 35521600 = 6219^2 + 5960^2 .

It is a cyclic number.

It is not a de Polignac number, because 74197561 - 2³ = 74197553 is a prime.

It is not a weakly prime, because it can be changed into another prime (74197567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37098780 + 37098781.

It is an arithmetic number, because the mean of its divisors is an integer number (37098781).

Almost surely, 2^74197561 is an apocalyptic number.

It is an amenable number.

74197561 is a deficient number, since it is larger than the sum of its proper divisors (1).

74197561 is an equidigital number, since it uses as much as digits as its factorization.

74197561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 40.

The square root of 74197561 is about 8613.8006129699. The cubic root of 74197561 is about 420.2069293995.

The spelling of 74197561 in words is "seventy-four million, one hundred ninety-seven thousand, five hundred sixty-one".