81701425 has 48 divisors (see below), whose sum is σ = 116867520. Its totient is φ = 56160000.

The previous prime is 81701423. The next prime is 81701437. The reversal of 81701425 is 52410718.

It is not a de Polignac number, because 81701425 - 2¹ = 81701423 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81701393 and 81701402.

It is not an unprimeable number, because it can be changed into a prime (81701423) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 623610 + ... + 623740.

It is an arithmetic number, because the mean of its divisors is an integer number (2434740).

Almost surely, 2^81701425 is an apocalyptic number.

It is an amenable number.

81701425 is a deficient number, since it is larger than the sum of its proper divisors (35166095).

81701425 is a wasteful number, since it uses less digits than its factorization.

81701425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274 (or 269 counting only the distinct ones).

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

The square root of 81701425 is about 9038.8840572274. The cubic root of 81701425 is about 433.9202090920.

The spelling of 81701425 in words is "eighty-one million, seven hundred one thousand, four hundred twenty-five".