61461531081 has 16 divisors (see below), whose sum is σ = 91462443520. Its totient is φ = 40790608560.

The previous prime is 61461531059. The next prime is 61461531091. The reversal of 61461531081 is 18013516416.

It is a happy number.

61461531081 is a `hidden beast` number, since 6 + 1 + 4 + 615 + 31 + 0 + 8 + 1 = 666.

61461531081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61461531081 - 2⁵ = 61461531049 is a prime.

It is a super-2 number, since 2×61461531081² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61461531011) 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, 5097910 + ... + 5109951.

It is an arithmetic number, because the mean of its divisors is an integer number (5716402720).

Almost surely, 2^61461531081 is an apocalyptic number.

It is an amenable number.

61461531081 is a deficient number, since it is larger than the sum of its proper divisors (30000912439).

61461531081 is a wasteful number, since it uses less digits than its factorization.

61461531081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10208093 (or 10208087 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The spelling of 61461531081 in words is "sixty-one billion, four hundred sixty-one million, five hundred thirty-one thousand, eighty-one".