61078581 has 6 divisors (see below), whose sum is σ = 88224630. Its totient is φ = 40719048.

The previous prime is 61078579. The next prime is 61078583. The reversal of 61078581 is 18587016.

61078581 is a `hidden beast` number, since 6 + 1 + 0 + 78 + 581 = 666.

It is an interprime number because it is at equal distance from previous prime (61078579) and next prime (61078583).

It can be written as a sum of positive squares in only one way, i.e., 61074225 + 4356 = 7815^2 + 66^2 .

It is not a de Polignac number, because 61078581 - 2¹ = 61078579 is a prime.

It is a super-2 number, since 2×61078581² = 7461186113947122, 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 (61078583) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3393246 + ... + 3393263.

It is an arithmetic number, because the mean of its divisors is an integer number (14704105).

Almost surely, 2^61078581 is an apocalyptic number.

It is an amenable number.

61078581 is a deficient number, since it is larger than the sum of its proper divisors (27146049).

61078581 is a wasteful number, since it uses less digits than its factorization.

61078581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6786515 (or 6786512 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 36.

The square root of 61078581 is about 7815.2786898485. The cubic root of 61078581 is about 393.8186806877.

The spelling of 61078581 in words is "sixty-one million, seventy-eight thousand, five hundred eighty-one".