1089856523 has 4 divisors (see below), whose sum is σ = 1245550320. Its totient is φ = 934162728.

The previous prime is 1089856517. The next prime is 1089856583. The reversal of 1089856523 is 3256589801.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3256589801 = 1031 ⋅3158671.

It is a cyclic number.

It is not a de Polignac number, because 1089856523 - 2⁸ = 1089856267 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1089856513) 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, 77846888 + ... + 77846901.

It is an arithmetic number, because the mean of its divisors is an integer number (311387580).

Almost surely, 2^1089856523 is an apocalyptic number.

1089856523 is a deficient number, since it is larger than the sum of its proper divisors (155693797).

1089856523 is an equidigital number, since it uses as much as digits as its factorization.

1089856523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155693796.

The product of its (nonzero) digits is 518400, while the sum is 47.

The square root of 1089856523 is about 33012.9750704174. The cubic root of 1089856523 is about 1029.0973091547.

The spelling of 1089856523 in words is "one billion, eighty-nine million, eight hundred fifty-six thousand, five hundred twenty-three".