61241781 has 8 divisors (see below), whose sum is σ = 81785664. Its totient is φ = 40762880.

The previous prime is 61241779. The next prime is 61241783. The reversal of 61241781 is 18714216.

It is an interprime number because it is at equal distance from previous prime (61241779) and next prime (61241783).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61241781 - 2¹ = 61241779 is a prime.

It is a super-2 number, since 2×61241781² = 7501111480103922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61241783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14001 + ... + 17846.

It is an arithmetic number, because the mean of its divisors is an integer number (10223208).

Almost surely, 2^61241781 is an apocalyptic number.

It is an amenable number.

61241781 is a deficient number, since it is larger than the sum of its proper divisors (20543883).

61241781 is a wasteful number, since it uses less digits than its factorization.

61241781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32491.

The product of its digits is 2688, while the sum is 30.

The square root of 61241781 is about 7825.7128109841. The cubic root of 61241781 is about 394.1691256878.

Adding to 61241781 its reverse (18714216), we get a palindrome (79955997).

The spelling of 61241781 in words is "sixty-one million, two hundred forty-one thousand, seven hundred eighty-one".