89971547405 has 8 divisors (see below), whose sum is σ = 114316789752. Its totient is φ = 67743282688.

The previous prime is 89971547389. The next prime is 89971547431. The reversal of 89971547405 is 50474517998.

89971547405 = 212098² + 212099².

It can be written as a sum of positive squares in 4 ways, for example, as 7627227556 + 82344319849 = 87334^2 + 286957^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 89971547405 - 2⁴ = 89971547389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 529244312 + ... + 529244481.

It is an arithmetic number, because the mean of its divisors is an integer number (14289598719).

Almost surely, 2^89971547405 is an apocalyptic number.

89971547405 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

89971547405 is the 212099-th centered square number.

It is an amenable number.

89971547405 is a deficient number, since it is larger than the sum of its proper divisors (24345242347).

89971547405 is a wasteful number, since it uses less digits than its factorization.

89971547405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1058488815.

The product of its (nonzero) digits is 12700800, while the sum is 59.

The spelling of 89971547405 in words is "eighty-nine billion, nine hundred seventy-one million, five hundred forty-seven thousand, four hundred five".