126556331 has 4 divisors (see below), whose sum is σ = 138061464. Its totient is φ = 115051200.

The previous prime is 126556301. The next prime is 126556343. The reversal of 126556331 is 133655621.

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

It is not a de Polignac number, because 126556331 - 2²⁶ = 59447467 is a prime.

It is a super-2 number, since 2×126556331² = 32033009832363122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126556301) 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, 5752550 + ... + 5752571.

It is an arithmetic number, because the mean of its divisors is an integer number (34515366).

Almost surely, 2^126556331 is an apocalyptic number.

126556331 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

126556331 is a deficient number, since it is larger than the sum of its proper divisors (11505133).

126556331 is a wasteful number, since it uses less digits than its factorization.

126556331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11505132.

The product of its digits is 16200, while the sum is 32.

The square root of 126556331 is about 11249.7258188811. The cubic root of 126556331 is about 502.0665549340.

The spelling of 126556331 in words is "one hundred twenty-six million, five hundred fifty-six thousand, three hundred thirty-one".