81245203 has 12 divisors (see below), whose sum is σ = 90518848. Its totient is φ = 72414720.

The previous prime is 81245201. The next prime is 81245209. The reversal of 81245203 is 30254218.

It is not a de Polignac number, because 81245203 - 2¹ = 81245201 is a prime.

It is a super-2 number, since 2×81245203² = 13201566021022418, which contains 22 as substring.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81245201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 180723 + ... + 181171.

Almost surely, 2^81245203 is an apocalyptic number.

81245203 is a deficient number, since it is larger than the sum of its proper divisors (9273645).

81245203 is an equidigital number, since it uses as much as digits as its factorization.

81245203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 942 (or 493 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 81245203 is about 9013.6120950482. The cubic root of 81245203 is about 433.1110287099. Note that the first 3 decimals are identical.

The spelling of 81245203 in words is "eighty-one million, two hundred forty-five thousand, two hundred three".