81574903 has 2 divisors, whose sum is σ = 81574904. Its totient is φ = 81574902.

The previous prime is 81574877. The next prime is 81574907. The reversal of 81574903 is 30947518.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81574903 - 2¹³ = 81566711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81574907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40787451 + 40787452.

It is an arithmetic number, because the mean of its divisors is an integer number (40787452).

Almost surely, 2^81574903 is an apocalyptic number.

81574903 is a deficient number, since it is larger than the sum of its proper divisors (1).

81574903 is an equidigital number, since it uses as much as digits as its factorization.

81574903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 81574903 is about 9031.8825833820. The cubic root of 81574903 is about 433.6961052222.

The spelling of 81574903 in words is "eighty-one million, five hundred seventy-four thousand, nine hundred three".