126213431 has 4 divisors (see below), whose sum is σ = 130284864. Its totient is φ = 122142000.

The previous prime is 126213427. The next prime is 126213433. The reversal of 126213431 is 134312621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134312621 = 8537 ⋅15733.

It is a cyclic number.

It is not a de Polignac number, because 126213431 - 2² = 126213427 is a prime.

It is a super-2 number, since 2×126213431² = 31859660329583522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 126213397 and 126213406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126213433) 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, 2035670 + ... + 2035731.

It is an arithmetic number, because the mean of its divisors is an integer number (32571216).

Almost surely, 2^126213431 is an apocalyptic number.

126213431 is a deficient number, since it is larger than the sum of its proper divisors (4071433).

126213431 is an equidigital number, since it uses as much as digits as its factorization.

126213431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4071432.

The product of its digits is 864, while the sum is 23.

The square root of 126213431 is about 11234.4751101242. The cubic root of 126213431 is about 501.6127007998.

The spelling of 126213431 in words is "one hundred twenty-six million, two hundred thirteen thousand, four hundred thirty-one".