26491143121 has 9 divisors (see below), whose sum is σ = 27074595081. Its totient is φ = 25920014772.

The previous prime is 26491143109. The next prime is 26491143131. The reversal of 26491143121 is 12134119462.

The square root of 26491143121 is 162761.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 26491143121 - 2⁹ = 26491142609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26491143131) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 7648036 + ... + 7651498.

Almost surely, 2^26491143121 is an apocalyptic number.

26491143121 is the 162761-st square number.

26491143121 is the 81381-st centered octagonal number.

It is an amenable number.

26491143121 is a deficient number, since it is larger than the sum of its proper divisors (583451960).

26491143121 is an frugal number, since it uses more digits than its factorization.

26491143121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7020 (or 3510 counting only the distinct ones).

The product of its digits is 10368, while the sum is 34.

The spelling of 26491143121 in words is "twenty-six billion, four hundred ninety-one million, one hundred forty-three thousand, one hundred twenty-one".