81249692 has 12 divisors (see below), whose sum is σ = 142271976. Its totient is φ = 40600560.

The previous prime is 81249671. The next prime is 81249713. The reversal of 81249692 is 29694218.

It is an interprime number because it is at equal distance from previous prime (81249671) and next prime (81249713).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2942 + ... + 13082.

It is an arithmetic number, because the mean of its divisors is an integer number (11855998).

Almost surely, 2^81249692 is an apocalyptic number.

It is an amenable number.

81249692 is a deficient number, since it is larger than the sum of its proper divisors (61022284).

81249692 is a wasteful number, since it uses less digits than its factorization.

81249692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12148 (or 12146 counting only the distinct ones).

The product of its digits is 62208, while the sum is 41.

The square root of 81249692 is about 9013.8611038777. The cubic root of 81249692 is about 433.1190053843.

The spelling of 81249692 in words is "eighty-one million, two hundred forty-nine thousand, six hundred ninety-two".