126815491 has 16 divisors (see below), whose sum is σ = 145006848. Its totient is φ = 109780000.

The previous prime is 126815473. The next prime is 126815497. The reversal of 126815491 is 194518621.

It is not a de Polignac number, because 126815491 - 2⁷ = 126815363 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 126815491.

It is not an unprimeable number, because it can be changed into a prime (126815497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62505 + ... + 64501.

It is an arithmetic number, because the mean of its divisors is an integer number (9062928).

Almost surely, 2^126815491 is an apocalyptic number.

126815491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

126815491 is a deficient number, since it is larger than the sum of its proper divisors (18191357).

126815491 is a wasteful number, since it uses less digits than its factorization.

126815491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2282.

The product of its digits is 17280, while the sum is 37.

The square root of 126815491 is about 11261.2384310075. The cubic root of 126815491 is about 502.4090291826.

The spelling of 126815491 in words is "one hundred twenty-six million, eight hundred fifteen thousand, four hundred ninety-one".