81912410949 has 16 divisors (see below), whose sum is σ = 111416670464. Its totient is φ = 53514820800.

The previous prime is 81912410917. The next prime is 81912410953. The reversal of 81912410949 is 94901421918.

It is not a de Polignac number, because 81912410949 - 2⁵ = 81912410917 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81912410898 and 81912410907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81912410999) 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, 776254 + ... + 875439.

It is an arithmetic number, because the mean of its divisors is an integer number (6963541904).

Almost surely, 2^81912410949 is an apocalyptic number.

It is an amenable number.

81912410949 is a deficient number, since it is larger than the sum of its proper divisors (29504259515).

81912410949 is a wasteful number, since it uses less digits than its factorization.

81912410949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1652028.

The product of its (nonzero) digits is 186624, while the sum is 48.

The spelling of 81912410949 in words is "eighty-one billion, nine hundred twelve million, four hundred ten thousand, nine hundred forty-nine".