126398551 has 6 divisors (see below), whose sum is σ = 128159160. Its totient is φ = 124661808.

The previous prime is 126398533. The next prime is 126398579. The reversal of 126398551 is 155893621.

It is not a de Polignac number, because 126398551 - 2¹⁹ = 125874263 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 (126398521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6531 + ... + 17188.

It is an arithmetic number, because the mean of its divisors is an integer number (21359860).

Almost surely, 2^126398551 is an apocalyptic number.

126398551 is a deficient number, since it is larger than the sum of its proper divisors (1760609).

126398551 is an frugal number, since it uses more digits than its factorization.

126398551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23865 (or 23792 counting only the distinct ones).

The product of its digits is 64800, while the sum is 40.

The square root of 126398551 is about 11242.7110164764. The cubic root of 126398551 is about 501.8578231036.

The spelling of 126398551 in words is "one hundred twenty-six million, three hundred ninety-eight thousand, five hundred fifty-one".