126279551 has 2 divisors, whose sum is σ = 126279552. Its totient is φ = 126279550.

The previous prime is 126279541. The next prime is 126279583. The reversal of 126279551 is 155972621.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 126279551 - 2⁶ = 126279487 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126279541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63139775 + 63139776.

It is an arithmetic number, because the mean of its divisors is an integer number (63139776).

Almost surely, 2^126279551 is an apocalyptic number.

126279551 is a deficient number, since it is larger than the sum of its proper divisors (1).

126279551 is an equidigital number, since it uses as much as digits as its factorization.

126279551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37800, while the sum is 38.

The square root of 126279551 is about 11237.4174524221. The cubic root of 126279551 is about 501.7002795450.

The spelling of 126279551 in words is "one hundred twenty-six million, two hundred seventy-nine thousand, five hundred fifty-one".