61242581 has 2 divisors, whose sum is σ = 61242582. Its totient is φ = 61242580.

The previous prime is 61242563. The next prime is 61242589. The reversal of 61242581 is 18524216.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51351556 + 9891025 = 7166^2 + 3145^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61242581 is a prime.

It is a super-2 number, since 2×61242581² = 7501307455083122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61242589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30621290 + 30621291.

It is an arithmetic number, because the mean of its divisors is an integer number (30621291).

Almost surely, 2^61242581 is an apocalyptic number.

It is an amenable number.

61242581 is a deficient number, since it is larger than the sum of its proper divisors (1).

61242581 is an equidigital number, since it uses as much as digits as its factorization.

61242581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3840, while the sum is 29.

The square root of 61242581 is about 7825.7639243719. The cubic root of 61242581 is about 394.1708420211.

Adding to 61242581 its reverse (18524216), we get a palindrome (79766797).

The spelling of 61242581 in words is "sixty-one million, two hundred forty-two thousand, five hundred eighty-one".