81794437 has 2 divisors, whose sum is σ = 81794438. Its totient is φ = 81794436.

The previous prime is 81794431. The next prime is 81794441. The reversal of 81794437 is 73449718.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81739681 + 54756 = 9041^2 + 234^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81794437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81794393 and 81794402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81794431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40897218 + 40897219.

It is an arithmetic number, because the mean of its divisors is an integer number (40897219).

Almost surely, 2^81794437 is an apocalyptic number.

It is an amenable number.

81794437 is a deficient number, since it is larger than the sum of its proper divisors (1).

81794437 is an equidigital number, since it uses as much as digits as its factorization.

81794437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 169344, while the sum is 43.

The square root of 81794437 is about 9044.0276978789. The cubic root of 81794437 is about 434.0848103845.

The spelling of 81794437 in words is "eighty-one million, seven hundred ninety-four thousand, four hundred thirty-seven".