81503158 has 8 divisors (see below), whose sum is σ = 133368840. Its totient is φ = 37046880.

The previous prime is 81503153. The next prime is 81503159. The reversal of 81503158 is 85130518.

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 (81503153) 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, 1852323 + ... + 1852366.

It is an arithmetic number, because the mean of its divisors is an integer number (16671105).

Almost surely, 2^81503158 is an apocalyptic number.

81503158 is a deficient number, since it is larger than the sum of its proper divisors (51865682).

81503158 is a wasteful number, since it uses less digits than its factorization.

81503158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3704702.

The product of its (nonzero) digits is 4800, while the sum is 31.

The square root of 81503158 is about 9027.9099463829. The cubic root of 81503158 is about 433.5689229133.

The spelling of 81503158 in words is "eighty-one million, five hundred three thousand, one hundred fifty-eight".