81146667 has 32 divisors (see below), whose sum is σ = 128378880. Its totient is φ = 44628480.

The previous prime is 81146647. The next prime is 81146683. The reversal of 81146667 is 76664118.

It is a happy number.

It is not a de Polignac number, because 81146667 - 2⁸ = 81146411 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81146617) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67423 + ... + 68615.

It is an arithmetic number, because the mean of its divisors is an integer number (4011840).

Almost surely, 2^81146667 is an apocalyptic number.

81146667 is a deficient number, since it is larger than the sum of its proper divisors (47232213).

81146667 is a wasteful number, since it uses less digits than its factorization.

81146667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1323.

The product of its digits is 48384, while the sum is 39.

The square root of 81146667 is about 9008.1444815234. The cubic root of 81146667 is about 432.9358622935.

The spelling of 81146667 in words is "eighty-one million, one hundred forty-six thousand, six hundred sixty-seven".