81137348 has 6 divisors (see below), whose sum is σ = 141990366. Its totient is φ = 40568672.

The previous prime is 81137347. The next prime is 81137359. The reversal of 81137348 is 84373118.

It can be written as a sum of positive squares in only one way, i.e., 71944324 + 9193024 = 8482^2 + 3032^2 .

It is not an unprimeable number, because it can be changed into a prime (81137347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10142165 + ... + 10142172.

It is an arithmetic number, because the mean of its divisors is an integer number (23665061).

Almost surely, 2^81137348 is an apocalyptic number.

It is an amenable number.

81137348 is a deficient number, since it is larger than the sum of its proper divisors (60853018).

81137348 is a wasteful number, since it uses less digits than its factorization.

81137348 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20284341 (or 20284339 counting only the distinct ones).

The product of its digits is 16128, while the sum is 35.

The square root of 81137348 is about 9007.6272125349. The cubic root of 81137348 is about 432.9192886666.

The spelling of 81137348 in words is "eighty-one million, one hundred thirty-seven thousand, three hundred forty-eight".