126642931 has 4 divisors (see below), whose sum is σ = 128533192. Its totient is φ = 124752672.

The previous prime is 126642871. The next prime is 126643019. The reversal of 126642931 is 139246621.

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: 139246621 = 509 ⋅273569.

It is a cyclic number.

It is not a de Polignac number, because 126642931 - 2⁹ = 126642419 is a prime.

It is a super-2 number, since 2×126642931² = 32076863944541522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126642031) 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, 945030 + ... + 945163.

It is an arithmetic number, because the mean of its divisors is an integer number (32133298).

Almost surely, 2^126642931 is an apocalyptic number.

126642931 is a deficient number, since it is larger than the sum of its proper divisors (1890261).

126642931 is an equidigital number, since it uses as much as digits as its factorization.

126642931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1890260.

The product of its digits is 15552, while the sum is 34.

The square root of 126642931 is about 11253.5741433555. The cubic root of 126642931 is about 502.1810469019.

The spelling of 126642931 in words is "one hundred twenty-six million, six hundred forty-two thousand, nine hundred thirty-one".