42501251 has 4 divisors (see below), whose sum is σ = 45770592. Its totient is φ = 39231912.

The previous prime is 42501209. The next prime is 42501253. The reversal of 42501251 is 15210524.

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 42501251 - 2¹⁴ = 42484867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42501253) 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, 1634651 + ... + 1634676.

It is an arithmetic number, because the mean of its divisors is an integer number (11442648).

Almost surely, 2^42501251 is an apocalyptic number.

42501251 is a deficient number, since it is larger than the sum of its proper divisors (3269341).

42501251 is a wasteful number, since it uses less digits than its factorization.

42501251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3269340.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 42501251 is about 6519.2983518167. The cubic root of 42501251 is about 348.9800263882.

Adding to 42501251 its reverse (15210524), we get a palindrome (57711775).

The spelling of 42501251 in words is "forty-two million, five hundred one thousand, two hundred fifty-one".