126513643 has 8 divisors (see below), whose sum is σ = 134980560. Its totient is φ = 118160640.

The previous prime is 126513617. The next prime is 126513713. The reversal of 126513643 is 346315621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 126513643 - 2²⁵ = 92959211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126513043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26178 + ... + 30631.

It is an arithmetic number, because the mean of its divisors is an integer number (16872570).

Almost surely, 2^126513643 is an apocalyptic number.

126513643 is a deficient number, since it is larger than the sum of its proper divisors (8466917).

126513643 is a wasteful number, since it uses less digits than its factorization.

126513643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56957.

The product of its digits is 12960, while the sum is 31.

The square root of 126513643 is about 11247.8283681785. The cubic root of 126513643 is about 502.0100988429.

The spelling of 126513643 in words is "one hundred twenty-six million, five hundred thirteen thousand, six hundred forty-three".