61081559 has 16 divisors (see below), whose sum is σ = 76343040. Its totient is φ = 47477760.

The previous prime is 61081483. The next prime is 61081567. The reversal of 61081559 is 95518016.

It is not a de Polignac number, because 61081559 - 2⁸ = 61081303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61081589) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42647 + ... + 44055.

It is an arithmetic number, because the mean of its divisors is an integer number (4771440).

Almost surely, 2^61081559 is an apocalyptic number.

61081559 is a deficient number, since it is larger than the sum of its proper divisors (15261481).

61081559 is a wasteful number, since it uses less digits than its factorization.

61081559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1990.

The product of its (nonzero) digits is 10800, while the sum is 35.

The square root of 61081559 is about 7815.4692117620. The cubic root of 61081559 is about 393.8250810382.

It can be divided in two parts, 6108 and 1559, that added together give a palindrome (7667).

The spelling of 61081559 in words is "sixty-one million, eighty-one thousand, five hundred fifty-nine".