125405621 has 16 divisors (see below), whose sum is σ = 139968000. Its totient is φ = 111394800.

The previous prime is 125405603. The next prime is 125405629. The reversal of 125405621 is 126504521.

It is not a de Polignac number, because 125405621 - 2⁶ = 125405557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125405629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128666 + ... + 129636.

It is an arithmetic number, because the mean of its divisors is an integer number (8748000).

Almost surely, 2^125405621 is an apocalyptic number.

125405621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

125405621 is a deficient number, since it is larger than the sum of its proper divisors (14562379).

125405621 is a wasteful number, since it uses less digits than its factorization.

125405621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1240.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 125405621 is about 11198.4651180418. The cubic root of 125405621 is about 500.5402440625.

The spelling of 125405621 in words is "one hundred twenty-five million, four hundred five thousand, six hundred twenty-one".