61773889 has 2 divisors, whose sum is σ = 61773890. Its totient is φ = 61773888.

The previous prime is 61773871. The next prime is 61773893. The reversal of 61773889 is 98837716.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33258289 + 28515600 = 5767^2 + 5340^2 .

It is a cyclic number.

It is not a de Polignac number, because 61773889 - 2²³ = 53385281 is a prime.

It is not a weakly prime, because it can be changed into another prime (61773809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30886944 + 30886945.

It is an arithmetic number, because the mean of its divisors is an integer number (30886945).

Almost surely, 2^61773889 is an apocalyptic number.

It is an amenable number.

61773889 is a deficient number, since it is larger than the sum of its proper divisors (1).

61773889 is an equidigital number, since it uses as much as digits as its factorization.

61773889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 49.

The square root of 61773889 is about 7859.6366964383. The cubic root of 61773889 is about 395.3074335741.

The spelling of 61773889 in words is "sixty-one million, seven hundred seventy-three thousand, eight hundred eighty-nine".