81125402 has 8 divisors (see below), whose sum is σ = 128092800. Its totient is φ = 38427804.

The previous prime is 81125371. The next prime is 81125449. The reversal of 81125402 is 20452118.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1067402 + ... + 1067477.

It is an arithmetic number, because the mean of its divisors is an integer number (16011600).

Almost surely, 2^81125402 is an apocalyptic number.

81125402 is a deficient number, since it is larger than the sum of its proper divisors (46967398).

81125402 is a wasteful number, since it uses less digits than its factorization.

81125402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2134900.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 81125402 is about 9006.9640834190. The cubic root of 81125402 is about 432.8980411245.

The spelling of 81125402 in words is "eighty-one million, one hundred twenty-five thousand, four hundred two".