61366889 has 4 divisors (see below), whose sum is σ = 64976724. Its totient is φ = 57757056.

The previous prime is 61366861. The next prime is 61366897. The reversal of 61366889 is 98866316.

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 21576025 + 39790864 = 4645^2 + 6308^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61366889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61366849) 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, 1804892 + ... + 1804925.

It is an arithmetic number, because the mean of its divisors is an integer number (16244181).

Almost surely, 2^61366889 is an apocalyptic number.

It is an amenable number.

61366889 is a deficient number, since it is larger than the sum of its proper divisors (3609835).

61366889 is a wasteful number, since it uses less digits than its factorization.

61366889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3609834.

The product of its digits is 373248, while the sum is 47.

The square root of 61366889 is about 7833.7021260704. The cubic root of 61366889 is about 394.4373530755.

The spelling of 61366889 in words is "sixty-one million, three hundred sixty-six thousand, eight hundred eighty-nine".