126761591 has 4 divisors (see below), whose sum is σ = 138285384. Its totient is φ = 115237800.

The previous prime is 126761587. The next prime is 126761603. The reversal of 126761591 is 195167621.

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

It is a cyclic number.

It is not a de Polignac number, because 126761591 - 2² = 126761587 is a prime.

It is a super-3 number, since 3×126761591³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126760591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5761880 + ... + 5761901.

It is an arithmetic number, because the mean of its divisors is an integer number (34571346).

Almost surely, 2^126761591 is an apocalyptic number.

126761591 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

126761591 is a deficient number, since it is larger than the sum of its proper divisors (11523793).

126761591 is a wasteful number, since it uses less digits than its factorization.

126761591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11523792.

The product of its digits is 22680, while the sum is 38.

The square root of 126761591 is about 11258.8450118118. The cubic root of 126761591 is about 502.3378399719.

The spelling of 126761591 in words is "one hundred twenty-six million, seven hundred sixty-one thousand, five hundred ninety-one".