81349007 has 2 divisors, whose sum is σ = 81349008. Its totient is φ = 81349006.

The previous prime is 81349003. The next prime is 81349027. The reversal of 81349007 is 70094318.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81349007 - 2² = 81349003 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81349003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40674503 + 40674504.

It is an arithmetic number, because the mean of its divisors is an integer number (40674504).

Almost surely, 2^81349007 is an apocalyptic number.

81349007 is a deficient number, since it is larger than the sum of its proper divisors (1).

81349007 is an equidigital number, since it uses as much as digits as its factorization.

81349007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 81349007 is about 9019.3684368696. The cubic root of 81349007 is about 433.2954068713.

The spelling of 81349007 in words is "eighty-one million, three hundred forty-nine thousand, seven".