81373007 has 4 divisors (see below), whose sum is σ = 81468816. Its totient is φ = 81277200.

The previous prime is 81373003. The next prime is 81373013. The reversal of 81373007 is 70037318.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81373007 - 2² = 81373003 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81373003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46619 + ... + 48332.

It is an arithmetic number, because the mean of its divisors is an integer number (20367204).

Almost surely, 2^81373007 is an apocalyptic number.

81373007 is a deficient number, since it is larger than the sum of its proper divisors (95809).

81373007 is an equidigital number, since it uses as much as digits as its factorization.

81373007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95808.

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 81373007 is about 9020.6988088507. The cubic root of 81373007 is about 433.3380136904.

The spelling of 81373007 in words is "eighty-one million, three hundred seventy-three thousand, seven".