126521823 has 4 divisors (see below), whose sum is σ = 168695768. Its totient is φ = 84347880.

The previous prime is 126521767. The next prime is 126521839. The reversal of 126521823 is 328125621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 328125621 = 3 ⋅109375207.

It is not a de Polignac number, because 126521823 - 2⁸ = 126521567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126521723) 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, 21086968 + ... + 21086973.

It is an arithmetic number, because the mean of its divisors is an integer number (42173942).

Almost surely, 2^126521823 is an apocalyptic number.

126521823 is a deficient number, since it is larger than the sum of its proper divisors (42173945).

126521823 is an equidigital number, since it uses as much as digits as its factorization.

126521823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42173944.

The product of its digits is 5760, while the sum is 30.

The square root of 126521823 is about 11248.1919880486. The cubic root of 126521823 is about 502.0209181085.

The spelling of 126521823 in words is "one hundred twenty-six million, five hundred twenty-one thousand, eight hundred twenty-three".