61880081 has 2 divisors, whose sum is σ = 61880082. Its totient is φ = 61880080.

The previous prime is 61880057. The next prime is 61880087. The reversal of 61880081 is 18008816.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32547025 + 29333056 = 5705^2 + 5416^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61880081 is a prime.

It is a super-2 number, since 2×61880081² = 7658288849133122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (61880087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30940040 + 30940041.

It is an arithmetic number, because the mean of its divisors is an integer number (30940041).

Almost surely, 2^61880081 is an apocalyptic number.

It is an amenable number.

61880081 is a deficient number, since it is larger than the sum of its proper divisors (1).

61880081 is an equidigital number, since it uses as much as digits as its factorization.

61880081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3072, while the sum is 32.

The square root of 61880081 is about 7866.3893242071. The cubic root of 61880081 is about 395.5338207868.

Adding to 61880081 its reverse (18008816), we get a palindrome (79888897).

The spelling of 61880081 in words is "sixty-one million, eight hundred eighty thousand, eighty-one".