81819350 has 24 divisors (see below), whose sum is σ = 153205968. Its totient is φ = 32508000.

The previous prime is 81819341. The next prime is 81819359. The reversal of 81819350 is 5391818.

It is an interprime number because it is at equal distance from previous prime (81819341) and next prime (81819359).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 81819350.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81819359) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2132 + ... + 12968.

It is an arithmetic number, because the mean of its divisors is an integer number (6383582).

Almost surely, 2^81819350 is an apocalyptic number.

81819350 is a deficient number, since it is larger than the sum of its proper divisors (71386618).

81819350 is a wasteful number, since it uses less digits than its factorization.

81819350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11000 (or 10995 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 81819350 is about 9045.4049107820. The cubic root of 81819350 is about 434.1288771838.

The spelling of 81819350 in words is "eighty-one million, eight hundred nineteen thousand, three hundred fifty".