126721460531 has 4 divisors (see below), whose sum is σ = 126738126672. Its totient is φ = 126704794392.

The previous prime is 126721460497. The next prime is 126721460533. The reversal of 126721460531 is 135064127621.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126721460531 is a prime.

It is a super-2 number, since 2×126721460531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126721460533) 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, 8321660 + ... + 8336873.

It is an arithmetic number, because the mean of its divisors is an integer number (31684531668).

Almost surely, 2^126721460531 is an apocalyptic number.

126721460531 is a deficient number, since it is larger than the sum of its proper divisors (16666141).

126721460531 is an equidigital number, since it uses as much as digits as its factorization.

126721460531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16666140.

The product of its (nonzero) digits is 60480, while the sum is 38.

The spelling of 126721460531 in words is "one hundred twenty-six billion, seven hundred twenty-one million, four hundred sixty thousand, five hundred thirty-one".