81236003 has 2 divisors, whose sum is σ = 81236004. Its totient is φ = 81236002.

The previous prime is 81235993. The next prime is 81236063. The reversal of 81236003 is 30063218.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81236003 - 2⁶ = 81235939 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81236003.

It is not a weakly prime, because it can be changed into another prime (81236063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40618001 + 40618002.

It is an arithmetic number, because the mean of its divisors is an integer number (40618002).

Almost surely, 2^81236003 is an apocalyptic number.

81236003 is a deficient number, since it is larger than the sum of its proper divisors (1).

81236003 is an equidigital number, since it uses as much as digits as its factorization.

81236003 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 81236003 is about 9013.1017413541. The cubic root of 81236003 is about 433.0946799626.

The spelling of 81236003 in words is "eighty-one million, two hundred thirty-six thousand, three".