125501643 has 10 divisors (see below), whose sum is σ = 187477884. Its totient is φ = 83667708.

The previous prime is 125501641. The next prime is 125501683. The reversal of 125501643 is 346105521.

125501643 is a `hidden beast` number, since 12 + 5 + 5 + 0 + 1 + 643 = 666.

It is not a de Polignac number, because 125501643 - 2¹ = 125501641 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (125501641) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 774621 + ... + 774782.

Almost surely, 2^125501643 is an apocalyptic number.

125501643 is a deficient number, since it is larger than the sum of its proper divisors (61976241).

125501643 is an equidigital number, since it uses as much as digits as its factorization.

125501643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1549415 (or 1549406 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 125501643 is about 11202.7515816428. The cubic root of 125501643 is about 500.6679645826.

The spelling of 125501643 in words is "one hundred twenty-five million, five hundred one thousand, six hundred forty-three".