81130498 has 4 divisors (see below), whose sum is σ = 121695750. Its totient is φ = 40565248.

The previous prime is 81130471. The next prime is 81130519. The reversal of 81130498 is 89403118.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 73496329 + 7634169 = 8573^2 + 2763^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20282623 + ... + 20282626.

Almost surely, 2^81130498 is an apocalyptic number.

81130498 is a deficient number, since it is larger than the sum of its proper divisors (40565252).

81130498 is a wasteful number, since it uses less digits than its factorization.

81130498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40565251.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 81130498 is about 9007.2469711894. The cubic root of 81130498 is about 432.9071052900.

The spelling of 81130498 in words is "eighty-one million, one hundred thirty thousand, four hundred ninety-eight".