125550591 has 4 divisors (see below), whose sum is σ = 167400792. Its totient is φ = 83700392.

The previous prime is 125550547. The next prime is 125550631. The reversal of 125550591 is 195055521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 195055521 = 3 ⋅65018507.

It is a cyclic number.

It is not a de Polignac number, because 125550591 - 2⁷ = 125550463 is a prime.

It is a plaindrome in base 16.

It is a zygodrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125550521) 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, 20925096 + ... + 20925101.

It is an arithmetic number, because the mean of its divisors is an integer number (41850198).

Almost surely, 2^125550591 is an apocalyptic number.

125550591 is a deficient number, since it is larger than the sum of its proper divisors (41850201).

125550591 is an equidigital number, since it uses as much as digits as its factorization.

125550591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41850200.

The product of its (nonzero) digits is 11250, while the sum is 33.

The square root of 125550591 is about 11204.9360105268. The cubic root of 125550591 is about 500.7330460950.

The spelling of 125550591 in words is "one hundred twenty-five million, five hundred fifty thousand, five hundred ninety-one".