89724667997 has 2 divisors, whose sum is σ = 89724667998. Its totient is φ = 89724667996.

The previous prime is 89724667979. The next prime is 89724668003. The reversal of 89724667997 is 79976642798.

Together with previous prime (89724667979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65899510681 + 23825157316 = 256709^2 + 154354^2 .

It is a cyclic number.

It is not a de Polignac number, because 89724667997 - 2²² = 89720473693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89724667957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44862333998 + 44862333999.

It is an arithmetic number, because the mean of its divisors is an integer number (44862333999).

Almost surely, 2^89724667997 is an apocalyptic number.

It is an amenable number.

89724667997 is a deficient number, since it is larger than the sum of its proper divisors (1).

89724667997 is an equidigital number, since it uses as much as digits as its factorization.

89724667997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576108288, while the sum is 74.

The spelling of 89724667997 in words is "eighty-nine billion, seven hundred twenty-four million, six hundred sixty-seven thousand, nine hundred ninety-seven".