126127531 has 4 divisors (see below), whose sum is σ = 126283864. Its totient is φ = 125971200.

The previous prime is 126127501. The next prime is 126127577. The reversal of 126127531 is 135721621.

It is a happy number.

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

It is a 8-Lehmer number, since φ(126127531) divides (126127531-1)⁸.

It is a cyclic number.

It is not a de Polignac number, because 126127531 - 2⁹ = 126127019 is a prime.

It is a super-2 number, since 2×126127531² = 31816308152311922, which contains 22 as substring.

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 126127531.

It is not an unprimeable number, because it can be changed into a prime (126127501) 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, 76950 + ... + 78571.

It is an arithmetic number, because the mean of its divisors is an integer number (31570966).

Almost surely, 2^126127531 is an apocalyptic number.

126127531 is the 5023-rd centered decagonal number.

126127531 is a deficient number, since it is larger than the sum of its proper divisors (156333).

126127531 is an equidigital number, since it uses as much as digits as its factorization.

126127531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156332.

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

The square root of 126127531 is about 11230.6514058624. The cubic root of 126127531 is about 501.4988769128.

The spelling of 126127531 in words is "one hundred twenty-six million, one hundred twenty-seven thousand, five hundred thirty-one".