61580981 has 8 divisors (see below), whose sum is σ = 76776384. Its totient is φ = 47985120.

The previous prime is 61580977. The next prime is 61580989. The reversal of 61580981 is 18908516.

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 61580981 - 2² = 61580977 is a prime.

It is a super-2 number, since 2×61580981² = 7584434441844722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61580989) 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, 399800 + ... + 399953.

It is an arithmetic number, because the mean of its divisors is an integer number (9597048).

Almost surely, 2^61580981 is an apocalyptic number.

It is an amenable number.

61580981 is a deficient number, since it is larger than the sum of its proper divisors (15195403).

61580981 is a wasteful number, since it uses less digits than its factorization.

61580981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799771.

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 61580981 is about 7847.3550321111. The cubic root of 61580981 is about 394.8955147451.

The spelling of 61580981 in words is "sixty-one million, five hundred eighty thousand, nine hundred eighty-one".