81437097 has 32 divisors (see below), whose sum is σ = 133125120. Its totient is φ = 43243200.

The previous prime is 81437077. The next prime is 81437101. The reversal of 81437097 is 79073418.

It is not a de Polignac number, because 81437097 - 2⁸ = 81436841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81437077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19222 + ... + 23072.

It is an arithmetic number, because the mean of its divisors is an integer number (4160160).

Almost surely, 2^81437097 is an apocalyptic number.

It is an amenable number.

81437097 is a deficient number, since it is larger than the sum of its proper divisors (51688023).

81437097 is a wasteful number, since it uses less digits than its factorization.

81437097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3933.

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 81437097 is about 9024.2504951935. The cubic root of 81437097 is about 433.4517506088.

The spelling of 81437097 in words is "eighty-one million, four hundred thirty-seven thousand, ninety-seven".