81035618 has 4 divisors (see below), whose sum is σ = 121553430. Its totient is φ = 40517808.

The previous prime is 81035609. The next prime is 81035659. The reversal of 81035618 is 81653018.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 74770609 + 6265009 = 8647^2 + 2503^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20258903 + ... + 20258906.

Almost surely, 2^81035618 is an apocalyptic number.

81035618 is a deficient number, since it is larger than the sum of its proper divisors (40517812).

81035618 is a wasteful number, since it uses less digits than its factorization.

81035618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40517811.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 81035618 is about 9001.9785602944. The cubic root of 81035618 is about 432.7382816075.

The spelling of 81035618 in words is "eighty-one million, thirty-five thousand, six hundred eighteen".