125501645 has 4 divisors (see below), whose sum is σ = 150601980. Its totient is φ = 100401312.

The previous prime is 125501641. The next prime is 125501683. The reversal of 125501645 is 546105521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 546105521 = 13 ⋅42008117.

It can be written as a sum of positive squares in 2 ways, for example, as 66227044 + 59274601 = 8138^2 + 7699^2 .

It is a cyclic number.

It is not a de Polignac number, because 125501645 - 2² = 125501641 is a prime.

It is a super-3 number, since 3×125501645³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 12550160 + ... + 12550169.

It is an arithmetic number, because the mean of its divisors is an integer number (37650495).

Almost surely, 2^125501645 is an apocalyptic number.

It is an amenable number.

125501645 is a deficient number, since it is larger than the sum of its proper divisors (25100335).

125501645 is an equidigital number, since it uses as much as digits as its factorization.

125501645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25100334.

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 125501645 is about 11202.7516709066. The cubic root of 125501645 is about 500.6679672421.

The spelling of 125501645 in words is "one hundred twenty-five million, five hundred one thousand, six hundred forty-five".