61800889 has 2 divisors, whose sum is σ = 61800890. Its totient is φ = 61800888.

The previous prime is 61800881. The next prime is 61800919. The reversal of 61800889 is 98800816.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58064400 + 3736489 = 7620^2 + 1933^2 .

It is a cyclic number.

It is not a de Polignac number, because 61800889 - 2³ = 61800881 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61800881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30900444 + 30900445.

It is an arithmetic number, because the mean of its divisors is an integer number (30900445).

Almost surely, 2^61800889 is an apocalyptic number.

It is an amenable number.

61800889 is a deficient number, since it is larger than the sum of its proper divisors (1).

61800889 is an equidigital number, since it uses as much as digits as its factorization.

61800889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 40.

The square root of 61800889 is about 7861.3541454383. The cubic root of 61800889 is about 395.3650185626.

The spelling of 61800889 in words is "sixty-one million, eight hundred thousand, eight hundred eighty-nine".