126451591 has 4 divisors (see below), whose sum is σ = 144516112. Its totient is φ = 108387072.

The previous prime is 126451583. The next prime is 126451603. The reversal of 126451591 is 195154621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 195154621 = 331 ⋅589591.

It is a cyclic number.

It is not a de Polignac number, because 126451591 - 2³ = 126451583 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 (126451531) 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, 9032250 + ... + 9032263.

It is an arithmetic number, because the mean of its divisors is an integer number (36129028).

Almost surely, 2^126451591 is an apocalyptic number.

126451591 is a deficient number, since it is larger than the sum of its proper divisors (18064521).

126451591 is an equidigital number, since it uses as much as digits as its factorization.

126451591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18064520.

The product of its digits is 10800, while the sum is 34.

The square root of 126451591 is about 11245.0696307315. The cubic root of 126451591 is about 501.9280106607.

The spelling of 126451591 in words is "one hundred twenty-six million, four hundred fifty-one thousand, five hundred ninety-one".