81692471 has 8 divisors (see below), whose sum is σ = 96374784. Its totient is φ = 67763160.

The previous prime is 81692453. The next prime is 81692483. The reversal of 81692471 is 17429618.

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

It is a cyclic number.

It is not a de Polignac number, because 81692471 - 2¹⁴ = 81676087 is a prime.

It is a super-3 number, since 3×81692471³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81692441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188015 + ... + 188448.

It is an arithmetic number, because the mean of its divisors is an integer number (12046848).

Almost surely, 2^81692471 is an apocalyptic number.

81692471 is a deficient number, since it is larger than the sum of its proper divisors (14682313).

81692471 is a wasteful number, since it uses less digits than its factorization.

81692471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376501.

The product of its digits is 24192, while the sum is 38.

The square root of 81692471 is about 9038.3887391504. The cubic root of 81692471 is about 433.9043568043.

The spelling of 81692471 in words is "eighty-one million, six hundred ninety-two thousand, four hundred seventy-one".