81469396 has 6 divisors (see below), whose sum is σ = 142571450. Its totient is φ = 40734696.

The previous prime is 81469393. The next prime is 81469411. The reversal of 81469396 is 69396418.

It can be written as a sum of positive squares in only one way, i.e., 64577296 + 16892100 = 8036^2 + 4110^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81469393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10183671 + ... + 10183678.

Almost surely, 2^81469396 is an apocalyptic number.

It is an amenable number.

81469396 is a deficient number, since it is larger than the sum of its proper divisors (61102054).

81469396 is a wasteful number, since it uses less digits than its factorization.

81469396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20367353 (or 20367351 counting only the distinct ones).

The product of its digits is 279936, while the sum is 46.

The square root of 81469396 is about 9026.0398846892. The cubic root of 81469396 is about 433.5090472142.

The spelling of 81469396 in words is "eighty-one million, four hundred sixty-nine thousand, three hundred ninety-six".