74861909 has 2 divisors, whose sum is σ = 74861910. Its totient is φ = 74861908.

The previous prime is 74861851. The next prime is 74861923. The reversal of 74861909 is 90916847.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60062500 + 14799409 = 7750^2 + 3847^2 .

It is a cyclic number.

It is not a de Polignac number, because 74861909 - 2¹² = 74857813 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 74861909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74861959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37430954 + 37430955.

It is an arithmetic number, because the mean of its divisors is an integer number (37430955).

Almost surely, 2^74861909 is an apocalyptic number.

It is an amenable number.

74861909 is a deficient number, since it is larger than the sum of its proper divisors (1).

74861909 is an equidigital number, since it uses as much as digits as its factorization.

74861909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 74861909 is about 8652.2776770051. The cubic root of 74861909 is about 421.4573503937.

The spelling of 74861909 in words is "seventy-four million, eight hundred sixty-one thousand, nine hundred nine".