81273202 has 4 divisors (see below), whose sum is σ = 121909806. Its totient is φ = 40636600.

The previous prime is 81273187. The next prime is 81273217. The reversal of 81273202 is 20237218.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20237218 = 2 ⋅10118609.

It is an interprime number because it is at equal distance from previous prime (81273187) and next prime (81273217).

It can be written as a sum of positive squares in only one way, i.e., 79762761 + 1510441 = 8931^2 + 1229^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20318299 + ... + 20318302.

Almost surely, 2^81273202 is an apocalyptic number.

81273202 is a deficient number, since it is larger than the sum of its proper divisors (40636604).

81273202 is a wasteful number, since it uses less digits than its factorization.

81273202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40636603.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 81273202 is about 9015.1651121874. The cubic root of 81273202 is about 433.1607763974.

The spelling of 81273202 in words is "eighty-one million, two hundred seventy-three thousand, two hundred two".