81470125 has 32 divisors (see below), whose sum is σ = 111855744. Its totient is φ = 58752000.

The previous prime is 81470111. The next prime is 81470131. The reversal of 81470125 is 52107418.

It is not a de Polignac number, because 81470125 - 2¹¹ = 81468077 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 81470093 and 81470102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 265222 + ... + 265528.

It is an arithmetic number, because the mean of its divisors is an integer number (3495492).

Almost surely, 2^81470125 is an apocalyptic number.

81470125 is the 4825-th nonagonal number.

It is an amenable number.

81470125 is a deficient number, since it is larger than the sum of its proper divisors (30385619).

81470125 is a wasteful number, since it uses less digits than its factorization.

81470125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526 (or 516 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 81470125 is about 9026.0802677574. The cubic root of 81470125 is about 433.5103402443.

It can be divided in two parts, 814701 and 25, that added together give a triangular number (814726 = T₁₂₇₆).

The spelling of 81470125 in words is "eighty-one million, four hundred seventy thousand, one hundred twenty-five".