125621242 has 4 divisors (see below), whose sum is σ = 188431866. Its totient is φ = 62810620.

The previous prime is 125621231. The next prime is 125621263. The reversal of 125621242 is 242126521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 87441201 + 38180041 = 9351^2 + 6179^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31405309 + ... + 31405312.

Almost surely, 2^125621242 is an apocalyptic number.

125621242 is a deficient number, since it is larger than the sum of its proper divisors (62810624).

125621242 is an equidigital number, since it uses as much as digits as its factorization.

125621242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62810623.

The product of its digits is 1920, while the sum is 25.

The square root of 125621242 is about 11208.0882401951. The cubic root of 125621242 is about 500.8269542061.

Adding to 125621242 its reverse (242126521), we get a palindrome (367747763).

The spelling of 125621242 in words is "one hundred twenty-five million, six hundred twenty-one thousand, two hundred forty-two".