89781409537 has 4 divisors (see below), whose sum is σ = 89914814980. Its totient is φ = 89648004096.

The previous prime is 89781409463. The next prime is 89781409541. The reversal of 89781409537 is 73590418798.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15362115136 + 74419294401 = 123944^2 + 272799^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-89781409537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (89781409567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66701712 + ... + 66703057.

It is an arithmetic number, because the mean of its divisors is an integer number (22478703745).

Almost surely, 2^89781409537 is an apocalyptic number.

It is an amenable number.

89781409537 is a deficient number, since it is larger than the sum of its proper divisors (133405443).

89781409537 is a wasteful number, since it uses less digits than its factorization.

89781409537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133405442.

The product of its (nonzero) digits is 15240960, while the sum is 61.

The spelling of 89781409537 in words is "eighty-nine billion, seven hundred eighty-one million, four hundred nine thousand, five hundred thirty-seven".