81198410 has 32 divisors (see below), whose sum is σ = 148638672. Its totient is φ = 31933440.

The previous prime is 81198391. The next prime is 81198413. The reversal of 81198410 is 1489118.

It can be written as a sum of positive squares in 8 ways, for example, as 1471369 + 79727041 = 1213^2 + 8929^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81198413) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204332 + ... + 204728.

Almost surely, 2^81198410 is an apocalyptic number.

81198410 is a deficient number, since it is larger than the sum of its proper divisors (67440262).

81198410 is a wasteful number, since it uses less digits than its factorization.

81198410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698.

The product of its (nonzero) digits is 2304, while the sum is 32.

The square root of 81198410 is about 9011.0160359418. The cubic root of 81198410 is about 433.0278629529.

The spelling of 81198410 in words is "eighty-one million, one hundred ninety-eight thousand, four hundred ten".