126115645 has 4 divisors (see below), whose sum is σ = 151338780. Its totient is φ = 100892512.

The previous prime is 126115637. The next prime is 126115663. The reversal of 126115645 is 546511621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 546511621 = 1567 ⋅348763.

It can be written as a sum of positive squares in 2 ways, for example, as 32684089 + 93431556 = 5717^2 + 9666^2 .

It is a cyclic number.

It is not a de Polignac number, because 126115645 - 2³ = 126115637 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12611560 + ... + 12611569.

It is an arithmetic number, because the mean of its divisors is an integer number (37834695).

Almost surely, 2^126115645 is an apocalyptic number.

It is an amenable number.

126115645 is a deficient number, since it is larger than the sum of its proper divisors (25223135).

126115645 is an equidigital number, since it uses as much as digits as its factorization.

126115645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25223134.

The product of its digits is 7200, while the sum is 31.

The square root of 126115645 is about 11230.1222166101. The cubic root of 126115645 is about 501.4831230091.

The spelling of 126115645 in words is "one hundred twenty-six million, one hundred fifteen thousand, six hundred forty-five".