126531019 has 4 divisors (see below), whose sum is σ = 128605360. Its totient is φ = 124456680.

The previous prime is 126531011. The next prime is 126531023. The reversal of 126531019 is 910135621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 126531019 - 2³ = 126531011 is a prime.

It is a super-2 number, since 2×126531019² = 32020197538356722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126531011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1037079 + ... + 1037200.

It is an arithmetic number, because the mean of its divisors is an integer number (32151340).

Almost surely, 2^126531019 is an apocalyptic number.

126531019 is a deficient number, since it is larger than the sum of its proper divisors (2074341).

126531019 is an equidigital number, since it uses as much as digits as its factorization.

126531019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2074340.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 126531019 is about 11248.6007574276. The cubic root of 126531019 is about 502.0330806282.

The spelling of 126531019 in words is "one hundred twenty-six million, five hundred thirty-one thousand, nineteen".