81125302 has 4 divisors (see below), whose sum is σ = 121687956. Its totient is φ = 40562650.

The previous prime is 81125281. The next prime is 81125327. The reversal of 81125302 is 20352118.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20352118 = 2 ⋅10176059.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20281324 + ... + 20281327.

It is an arithmetic number, because the mean of its divisors is an integer number (30421989).

Almost surely, 2^81125302 is an apocalyptic number.

81125302 is a deficient number, since it is larger than the sum of its proper divisors (40562654).

81125302 is a wasteful number, since it uses less digits than its factorization.

81125302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40562653.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 81125302 is about 9006.9585321572. The cubic root of 81125302 is about 432.8978632524.

The spelling of 81125302 in words is "eighty-one million, one hundred twenty-five thousand, three hundred two".