126513291 has 4 divisors (see below), whose sum is σ = 168684392. Its totient is φ = 84342192.

The previous prime is 126513259. The next prime is 126513293. The reversal of 126513291 is 192315621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 192315621 = 3 ⋅64105207.

It is not a de Polignac number, because 126513291 - 2⁵ = 126513259 is a prime.

It is a super-2 number, since 2×126513291² = 32011225599301362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126513293) 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 3 ways as a sum of consecutive naturals, for example, 21085546 + ... + 21085551.

It is an arithmetic number, because the mean of its divisors is an integer number (42171098).

Almost surely, 2^126513291 is an apocalyptic number.

126513291 is a deficient number, since it is larger than the sum of its proper divisors (42171101).

126513291 is an equidigital number, since it uses as much as digits as its factorization.

126513291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42171100.

The product of its digits is 3240, while the sum is 30.

The square root of 126513291 is about 11247.8127207026. The cubic root of 126513291 is about 502.0096332601.

The spelling of 126513291 in words is "one hundred twenty-six million, five hundred thirteen thousand, two hundred ninety-one".