126555517031 has 4 divisors (see below), whose sum is σ = 126709665864. Its totient is φ = 126401368200.

The previous prime is 126555517003. The next prime is 126555517051. The reversal of 126555517031 is 130715555621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 126555517031 - 2¹⁴ = 126555500647 is a prime.

It is a super-2 number, since 2×126555517031² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 126555517031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126555517051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77073185 + ... + 77074826.

It is an arithmetic number, because the mean of its divisors is an integer number (31677416466).

Almost surely, 2^126555517031 is an apocalyptic number.

126555517031 is a deficient number, since it is larger than the sum of its proper divisors (154148833).

126555517031 is an equidigital number, since it uses as much as digits as its factorization.

126555517031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154148832.

The product of its (nonzero) digits is 157500, while the sum is 41.

The spelling of 126555517031 in words is "one hundred twenty-six billion, five hundred fifty-five million, five hundred seventeen thousand, thirty-one".