81497452 has 6 divisors (see below), whose sum is σ = 142620548. Its totient is φ = 40748724.

The previous prime is 81497431. The next prime is 81497477. The reversal of 81497452 is 25479418.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10187178 + ... + 10187185.

Almost surely, 2^81497452 is an apocalyptic number.

It is an amenable number.

81497452 is a deficient number, since it is larger than the sum of its proper divisors (61123096).

81497452 is a wasteful number, since it uses less digits than its factorization.

81497452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20374367 (or 20374365 counting only the distinct ones).

The product of its digits is 80640, while the sum is 40.

The square root of 81497452 is about 9027.5939208629. The cubic root of 81497452 is about 433.5588046877.

The spelling of 81497452 in words is "eighty-one million, four hundred ninety-seven thousand, four hundred fifty-two".