81852154 has 8 divisors (see below), whose sum is σ = 125772948. Its totient is φ = 39927840.

The previous prime is 81852151. The next prime is 81852167. The reversal of 81852154 is 45125818.

It can be written as a sum of positive squares in 2 ways, for example, as 81090025 + 762129 = 9005^2 + 873^2 .

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

It is a super-2 number, since 2×81852154² = 13399550228879432, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81852151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 499017 + ... + 499180.

Almost surely, 2^81852154 is an apocalyptic number.

81852154 is a deficient number, since it is larger than the sum of its proper divisors (43920794).

81852154 is a wasteful number, since it uses less digits than its factorization.

81852154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 998240.

The product of its digits is 12800, while the sum is 34.

The square root of 81852154 is about 9047.2180254485. The cubic root of 81852154 is about 434.1868881591.

The spelling of 81852154 in words is "eighty-one million, eight hundred fifty-two thousand, one hundred fifty-four".