81425337 has 8 divisors (see below), whose sum is σ = 124076736. Its totient is φ = 46528752.

The previous prime is 81425329. The next prime is 81425339. The reversal of 81425337 is 73352418.

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

It is not a de Polignac number, because 81425337 - 2³ = 81425329 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81425298 and 81425307.

It is not an unprimeable number, because it can be changed into a prime (81425339) 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, 1938678 + ... + 1938719.

It is an arithmetic number, because the mean of its divisors is an integer number (15509592).

Almost surely, 2^81425337 is an apocalyptic number.

It is an amenable number.

81425337 is a deficient number, since it is larger than the sum of its proper divisors (42651399).

81425337 is a wasteful number, since it uses less digits than its factorization.

81425337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3877407.

The product of its digits is 20160, while the sum is 33.

The square root of 81425337 is about 9023.5988940112. The cubic root of 81425337 is about 433.4308852696.

The spelling of 81425337 in words is "eighty-one million, four hundred twenty-five thousand, three hundred thirty-seven".