81502903 has 2 divisors, whose sum is σ = 81502904. Its totient is φ = 81502902.

The previous prime is 81502877. The next prime is 81502921. The reversal of 81502903 is 30920518.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81502903 - 2⁵ = 81502871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81502933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40751451 + 40751452.

It is an arithmetic number, because the mean of its divisors is an integer number (40751452).

Almost surely, 2^81502903 is an apocalyptic number.

81502903 is a deficient number, since it is larger than the sum of its proper divisors (1).

81502903 is an equidigital number, since it uses as much as digits as its factorization.

81502903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 81502903 is about 9027.8958235017. The cubic root of 81502903 is about 433.5684707419.

The spelling of 81502903 in words is "eighty-one million, five hundred two thousand, nine hundred three".