81190502 has 8 divisors (see below), whose sum is σ = 121905000. Its totient is φ = 40555504.

The previous prime is 81190489. The next prime is 81190507. The reversal of 81190502 is 20509118.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81190507) 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, 17252 + ... + 21447.

It is an arithmetic number, because the mean of its divisors is an integer number (15238125).

Almost surely, 2^81190502 is an apocalyptic number.

81190502 is a deficient number, since it is larger than the sum of its proper divisors (40714498).

81190502 is a wasteful number, since it uses less digits than its factorization.

81190502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39750.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 81190502 is about 9010.5772290126. The cubic root of 81190502 is about 433.0138048142.

The spelling of 81190502 in words is "eighty-one million, one hundred ninety thousand, five hundred two".