81674737 has 2 divisors, whose sum is σ = 81674738. Its totient is φ = 81674736.

The previous prime is 81674731. The next prime is 81674741. The reversal of 81674737 is 73747618.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81162081 + 512656 = 9009^2 + 716^2 .

It is a cyclic number.

It is not a de Polignac number, because 81674737 - 2³ = 81674729 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81674693 and 81674702.

It is not a weakly prime, because it can be changed into another prime (81674731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40837368 + 40837369.

It is an arithmetic number, because the mean of its divisors is an integer number (40837369).

Almost surely, 2^81674737 is an apocalyptic number.

It is an amenable number.

81674737 is a deficient number, since it is larger than the sum of its proper divisors (1).

81674737 is an equidigital number, since it uses as much as digits as its factorization.

81674737 is an evil number, because the sum of its binary digits is even.

The product of its digits is 197568, while the sum is 43.

The square root of 81674737 is about 9037.4076482142. The cubic root of 81674737 is about 433.8729568615.

The spelling of 81674737 in words is "eighty-one million, six hundred seventy-four thousand, seven hundred thirty-seven".