81337407 has 8 divisors (see below), whose sum is σ = 113165184. Its totient is φ = 51867288.

The previous prime is 81337391. The next prime is 81337409. The reversal of 81337407 is 70473318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81337407 - 2⁴ = 81337391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81337409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 589333 + ... + 589470.

It is an arithmetic number, because the mean of its divisors is an integer number (14145648).

Almost surely, 2^81337407 is an apocalyptic number.

81337407 is a deficient number, since it is larger than the sum of its proper divisors (31827777).

81337407 is a wasteful number, since it uses less digits than its factorization.

81337407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1178829.

The product of its (nonzero) digits is 14112, while the sum is 33.

The square root of 81337407 is about 9018.7253533967. The cubic root of 81337407 is about 433.2748105714.

The spelling of 81337407 in words is "eighty-one million, three hundred thirty-seven thousand, four hundred seven".