126137549 has 4 divisors (see below), whose sum is σ = 126160764. Its totient is φ = 126114336.

The previous prime is 126137537. The next prime is 126137567. The reversal of 126137549 is 945731621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 945731621 = 907 ⋅1042703.

It can be written as a sum of positive squares in 2 ways, for example, as 31561924 + 94575625 = 5618^2 + 9725^2 .

It is a cyclic number.

It is not a de Polignac number, because 126137549 - 2⁸ = 126137293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126133549) 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, 1409 + ... + 15945.

It is an arithmetic number, because the mean of its divisors is an integer number (31540191).

Almost surely, 2^126137549 is an apocalyptic number.

It is an amenable number.

126137549 is a deficient number, since it is larger than the sum of its proper divisors (23215).

126137549 is an equidigital number, since it uses as much as digits as its factorization.

126137549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23214.

The product of its digits is 45360, while the sum is 38.

The square root of 126137549 is about 11231.0974085349. The cubic root of 126137549 is about 501.5121541693.

The spelling of 126137549 in words is "one hundred twenty-six million, one hundred thirty-seven thousand, five hundred forty-nine".