61355889 has 27 divisors (see below), whose sum is σ = 103371723. Its totient is φ = 34966512.

The previous prime is 61355887. The next prime is 61355891. The reversal of 61355889 is 98855316.

The square root of 61355889 is 7833.

It is a perfect power (a square), and thus also a powerful number.

61355889 is a `hidden beast` number, since 6 + 13 + 558 + 89 = 666.

It is an interprime number because it is at equal distance from previous prime (61355887) and next prime (61355891).

It can be written as a sum of positive squares in only one way, i.e., 33350625 + 28005264 = 5775^2 + 5292^2 .

It is not a de Polignac number, because 61355889 - 2¹ = 61355887 is a prime.

It is a super-2 number, since 2×61355889² = 7529090229960642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61355887) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 164307 + ... + 164679.

Almost surely, 2^61355889 is an apocalyptic number.

61355889 is the 7833-rd square number.

61355889 is the 3917-th centered octagonal number.

It is an amenable number.

61355889 is a deficient number, since it is larger than the sum of its proper divisors (42015834).

61355889 is an equidigital number, since it uses as much as digits as its factorization.

61355889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766 (or 383 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The cubic root of 61355889 is about 394.4137840672.

The spelling of 61355889 in words is "sixty-one million, three hundred fifty-five thousand, eight hundred eighty-nine".