81130203 has 24 divisors (see below), whose sum is σ = 146105856. Its totient is φ = 42145200.

The previous prime is 81130199. The next prime is 81130211. The reversal of 81130203 is 30203118.

It is not a de Polignac number, because 81130203 - 2² = 81130199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81130213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57843 + ... + 59228.

It is an arithmetic number, because the mean of its divisors is an integer number (6087744).

Almost surely, 2^81130203 is an apocalyptic number.

81130203 is a deficient number, since it is larger than the sum of its proper divisors (64975653).

81130203 is a wasteful number, since it uses less digits than its factorization.

81130203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117095 (or 117092 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 81130203 is about 9007.2305954716. The cubic root of 81130203 is about 432.9065805891.

The spelling of 81130203 in words is "eighty-one million, one hundred thirty thousand, two hundred three".