126263551 has 4 divisors (see below), whose sum is σ = 126411400. Its totient is φ = 126115704.

The previous prime is 126263521. The next prime is 126263653. The reversal of 126263551 is 155362621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155362621 = 2741 ⋅56681.

It is a cyclic number.

It is not a de Polignac number, because 126263551 - 2⁵ = 126263519 is a prime.

It is a super-2 number, since 2×126263551² = 31884968622259202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126263521) 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, 72636 + ... + 74353.

It is an arithmetic number, because the mean of its divisors is an integer number (31602850).

Almost surely, 2^126263551 is an apocalyptic number.

126263551 is a deficient number, since it is larger than the sum of its proper divisors (147849).

126263551 is an equidigital number, since it uses as much as digits as its factorization.

126263551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147848.

The product of its digits is 10800, while the sum is 31.

The square root of 126263551 is about 11236.7055225275. The cubic root of 126263551 is about 501.6790896705.

The spelling of 126263551 in words is "one hundred twenty-six million, two hundred sixty-three thousand, five hundred fifty-one".