81375737 has 8 divisors (see below), whose sum is σ = 83672160. Its totient is φ = 79097760.

The previous prime is 81375733. The next prime is 81375739. The reversal of 81375737 is 73757318.

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

It is a cyclic number.

It is not a de Polignac number, because 81375737 - 2² = 81375733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81375694 and 81375703.

It is not an unprimeable number, because it can be changed into a prime (81375731) 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, 4589 + ... + 13557.

It is an arithmetic number, because the mean of its divisors is an integer number (10459020).

Almost surely, 2^81375737 is an apocalyptic number.

It is an amenable number.

81375737 is a deficient number, since it is larger than the sum of its proper divisors (2296423).

81375737 is a wasteful number, since it uses less digits than its factorization.

81375737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9223.

The product of its digits is 123480, while the sum is 41.

The square root of 81375737 is about 9020.8501262353. The cubic root of 81375737 is about 433.3428596854.

The spelling of 81375737 in words is "eighty-one million, three hundred seventy-five thousand, seven hundred thirty-seven".