61049581 has 2 divisors, whose sum is σ = 61049582. Its totient is φ = 61049580.

The previous prime is 61049543. The next prime is 61049591. The reversal of 61049581 is 18594016.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55800900 + 5248681 = 7470^2 + 2291^2 .

It is a cyclic number.

It is not a de Polignac number, because 61049581 - 2⁷ = 61049453 is a prime.

It is a super-2 number, since 2×61049581² = 7454102680551122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61049501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30524790 + 30524791.

It is an arithmetic number, because the mean of its divisors is an integer number (30524791).

Almost surely, 2^61049581 is an apocalyptic number.

It is an amenable number.

61049581 is a deficient number, since it is larger than the sum of its proper divisors (1).

61049581 is an equidigital number, since it uses as much as digits as its factorization.

61049581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 61049581 is about 7813.4231294612. The cubic root of 61049581 is about 393.7563426878.

The spelling of 61049581 in words is "sixty-one million, forty-nine thousand, five hundred eighty-one".