81295037 has 4 divisors (see below), whose sum is σ = 86077116. Its totient is φ = 76512960.

The previous prime is 81295009. The next prime is 81295043. The reversal of 81295037 is 73059218.

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

It can be written as a sum of positive squares in 2 ways, for example, as 25060036 + 56235001 = 5006^2 + 7499^2 .

It is a cyclic number.

It is not a de Polignac number, because 81295037 - 2⁶ = 81294973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81294988 and 81295006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81291037) 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, 2391014 + ... + 2391047.

It is an arithmetic number, because the mean of its divisors is an integer number (21519279).

Almost surely, 2^81295037 is an apocalyptic number.

It is an amenable number.

81295037 is a deficient number, since it is larger than the sum of its proper divisors (4782079).

81295037 is a wasteful number, since it uses less digits than its factorization.

81295037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4782078.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 81295037 is about 9016.3760458401. The cubic root of 81295037 is about 433.1995641669.

The spelling of 81295037 in words is "eighty-one million, two hundred ninety-five thousand, thirty-seven".