81061137849 has 8 divisors (see below), whose sum is σ = 108100171872. Its totient is φ = 54031431200.

The previous prime is 81061137827. The next prime is 81061137881. The reversal of 81061137849 is 94873116018.

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 81061137849 - 2¹² = 81061133753 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81061137798 and 81061137807.

It is not an unprimeable number, because it can be changed into a prime (81061137809) 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, 2311539 + ... + 2346344.

It is an arithmetic number, because the mean of its divisors is an integer number (13512521484).

Almost surely, 2^81061137849 is an apocalyptic number.

It is an amenable number.

81061137849 is a deficient number, since it is larger than the sum of its proper divisors (27039034023).

81061137849 is a wasteful number, since it uses less digits than its factorization.

81061137849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4663687.

The product of its (nonzero) digits is 290304, while the sum is 48.

The spelling of 81061137849 in words is "eighty-one billion, sixty-one million, one hundred thirty-seven thousand, eight hundred forty-nine".