42145251 has 4 divisors (see below), whose sum is σ = 56193672. Its totient is φ = 28096832.

The previous prime is 42145247. The next prime is 42145277. The reversal of 42145251 is 15254124.

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 42145251 - 2² = 42145247 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42145241) 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, 7024206 + ... + 7024211.

It is an arithmetic number, because the mean of its divisors is an integer number (14048418).

Almost surely, 2^42145251 is an apocalyptic number.

42145251 is a deficient number, since it is larger than the sum of its proper divisors (14048421).

42145251 is a wasteful number, since it uses less digits than its factorization.

42145251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14048420.

The product of its digits is 1600, while the sum is 24.

The square root of 42145251 is about 6491.9373841712. The cubic root of 42145251 is about 348.0029148256.

Adding to 42145251 its reverse (15254124), we get a palindrome (57399375).

The spelling of 42145251 in words is "forty-two million, one hundred forty-five thousand, two hundred fifty-one".