42449251 has 6 divisors (see below), whose sum is σ = 45965940. Its totient is φ = 39183768.

The previous prime is 42449233. The next prime is 42449279. The reversal of 42449251 is 15294424.

It is not a de Polignac number, because 42449251 - 2²¹ = 40352099 is a prime.

It is a super-2 number, since 2×42449251² = 3603877820922002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42449291) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 125421 + ... + 125758.

It is an arithmetic number, because the mean of its divisors is an integer number (7660990).

Almost surely, 2^42449251 is an apocalyptic number.

42449251 is a deficient number, since it is larger than the sum of its proper divisors (3516689).

42449251 is a wasteful number, since it uses less digits than its factorization.

42449251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251205 (or 251192 counting only the distinct ones).

The product of its digits is 11520, while the sum is 31.

The square root of 42449251 is about 6515.3089719521. The cubic root of 42449251 is about 348.8376433847.

The spelling of 42449251 in words is "forty-two million, four hundred forty-nine thousand, two hundred fifty-one".