61789081 has 2 divisors, whose sum is σ = 61789082. Its totient is φ = 61789080.

The previous prime is 61789069. The next prime is 61789087. The reversal of 61789081 is 18098716.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41718681 + 20070400 = 6459^2 + 4480^2 .

It is a cyclic number.

It is not a de Polignac number, because 61789081 - 2⁷ = 61788953 is a prime.

It is a super-2 number, since 2×61789081² = 7635781061649122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61789087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30894540 + 30894541.

It is an arithmetic number, because the mean of its divisors is an integer number (30894541).

Almost surely, 2^61789081 is an apocalyptic number.

It is an amenable number.

61789081 is a deficient number, since it is larger than the sum of its proper divisors (1).

61789081 is an equidigital number, since it uses as much as digits as its factorization.

61789081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 61789081 is about 7860.6030939108. The cubic root of 61789081 is about 395.3398367916.

It can be divided in two parts, 617 and 89081, that added together give a palindrome (89698).

The spelling of 61789081 in words is "sixty-one million, seven hundred eighty-nine thousand, eighty-one".