61012581 has 16 divisors (see below), whose sum is σ = 93333504. Its totient is φ = 34728624.

The previous prime is 61012573. The next prime is 61012603. The reversal of 61012581 is 18521016.

61012581 is a nontrivial binomial coefficient, being equal to C(11047, 2).

It is not a de Polignac number, because 61012581 - 2³ = 61012573 is a prime.

It is a super-2 number, since 2×61012581² = 7445070080563122, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61012561) 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, 1 + ... + 11046.

It is an arithmetic number, because the mean of its divisors is an integer number (5833344).

Almost surely, 2^61012581 is an apocalyptic number.

61012581 is the 11046-th triangular number.

It is an amenable number.

61012581 is a deficient number, since it is larger than the sum of its proper divisors (32320923).

61012581 is a wasteful number, since it uses less digits than its factorization.

61012581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11320.

The product of its (nonzero) digits is 480, while the sum is 24.

The square root of 61012581 is about 7811.0550503757. The cubic root of 61012581 is about 393.6767793303.

Adding to 61012581 its reverse (18521016), we get a palindrome (79533597).

The spelling of 61012581 in words is "sixty-one million, twelve thousand, five hundred eighty-one".