126215713 has 4 divisors (see below), whose sum is σ = 135924628. Its totient is φ = 116506800.

The previous prime is 126215659. The next prime is 126215723. The reversal of 126215713 is 317512621.

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: 317512621 = 17 ⋅18677213.

It can be written as a sum of positive squares in 2 ways, for example, as 71707024 + 54508689 = 8468^2 + 7383^2 .

It is a cyclic number.

It is not a de Polignac number, because 126215713 - 2²⁵ = 92661281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126215723) 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, 4854438 + ... + 4854463.

It is an arithmetic number, because the mean of its divisors is an integer number (33981157).

Almost surely, 2^126215713 is an apocalyptic number.

126215713 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

126215713 is a deficient number, since it is larger than the sum of its proper divisors (9708915).

126215713 is an equidigital number, since it uses as much as digits as its factorization.

126215713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9708914.

The product of its digits is 2520, while the sum is 28.

The square root of 126215713 is about 11234.5766720424. The cubic root of 126215713 is about 501.6157239152.

The spelling of 126215713 in words is "one hundred twenty-six million, two hundred fifteen thousand, seven hundred thirteen".