81212476 has 6 divisors (see below), whose sum is σ = 142121840. Its totient is φ = 40606236.

The previous prime is 81212473. The next prime is 81212491. The reversal of 81212476 is 67421218.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81212473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10151556 + ... + 10151563.

Almost surely, 2^81212476 is an apocalyptic number.

It is an amenable number.

81212476 is a deficient number, since it is larger than the sum of its proper divisors (60909364).

81212476 is a wasteful number, since it uses less digits than its factorization.

81212476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20303123 (or 20303121 counting only the distinct ones).

The product of its digits is 5376, while the sum is 31.

The square root of 81212476 is about 9011.7964912663. The cubic root of 81212476 is about 433.0528659804.

The spelling of 81212476 in words is "eighty-one million, two hundred twelve thousand, four hundred seventy-six".