81473807 has 2 divisors, whose sum is σ = 81473808. Its totient is φ = 81473806.

The previous prime is 81473803. The next prime is 81473827. The reversal of 81473807 is 70837418.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81473807 - 2² = 81473803 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81473801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40736903 + 40736904.

It is an arithmetic number, because the mean of its divisors is an integer number (40736904).

Almost surely, 2^81473807 is an apocalyptic number.

81473807 is a deficient number, since it is larger than the sum of its proper divisors (1).

81473807 is an equidigital number, since it uses as much as digits as its factorization.

81473807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37632, while the sum is 38.

The square root of 81473807 is about 9026.2842299586. The cubic root of 81473807 is about 433.5168709042.

The spelling of 81473807 in words is "eighty-one million, four hundred seventy-three thousand, eight hundred seven".