126638531 has 8 divisors (see below), whose sum is σ = 130256400. Its totient is φ = 123031008.

The previous prime is 126638507. The next prime is 126638537. The reversal of 126638531 is 135836621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 126638531 - 2⁶ = 126638467 is a prime.

It is a super-2 number, since 2×126638531² = 32074635067675922, 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 = 126638491 and 126638500.

It is not an unprimeable number, because it can be changed into a prime (126638537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26945 + ... + 31293.

It is an arithmetic number, because the mean of its divisors is an integer number (16282050).

Almost surely, 2^126638531 is an apocalyptic number.

126638531 is a deficient number, since it is larger than the sum of its proper divisors (3617869).

126638531 is an equidigital number, since it uses as much as digits as its factorization.

126638531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5173.

The product of its digits is 25920, while the sum is 35.

The square root of 126638531 is about 11253.3786482105. The cubic root of 126638531 is about 502.1752310169.

The spelling of 126638531 in words is "one hundred twenty-six million, six hundred thirty-eight thousand, five hundred thirty-one".