81577103 has 2 divisors, whose sum is σ = 81577104. Its totient is φ = 81577102.

The previous prime is 81577091. The next prime is 81577129. The reversal of 81577103 is 30177518.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81577103 - 2¹² = 81573007 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81577103.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81577403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40788551 + 40788552.

It is an arithmetic number, because the mean of its divisors is an integer number (40788552).

Almost surely, 2^81577103 is an apocalyptic number.

81577103 is a deficient number, since it is larger than the sum of its proper divisors (1).

81577103 is an equidigital number, since it uses as much as digits as its factorization.

81577103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5880, while the sum is 32.

The square root of 81577103 is about 9032.0043733382. The cubic root of 81577103 is about 433.7000039820.

The spelling of 81577103 in words is "eighty-one million, five hundred seventy-seven thousand, one hundred three".