42125099 has 4 divisors (see below), whose sum is σ = 44603064. Its totient is φ = 39647136.

The previous prime is 42125087. The next prime is 42125107. The reversal of 42125099 is 99052124.

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

It is a cyclic number.

It is not a de Polignac number, because 42125099 - 2¹² = 42121003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42125059) 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, 1238957 + ... + 1238990.

It is an arithmetic number, because the mean of its divisors is an integer number (11150766).

Almost surely, 2^42125099 is an apocalyptic number.

42125099 is a deficient number, since it is larger than the sum of its proper divisors (2477965).

42125099 is a wasteful number, since it uses less digits than its factorization.

42125099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2477964.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 42125099 is about 6490.3851195441. The cubic root of 42125099 is about 347.9474394349.

Subtracting 42125099 from its reverse (99052124), we obtain a square (56927025 = 7545²).

The spelling of 42125099 in words is "forty-two million, one hundred twenty-five thousand, ninety-nine".