42251251 has 8 divisors (see below), whose sum is σ = 48341504. Its totient is φ = 36174600.

The previous prime is 42251227. The next prime is 42251267. The reversal of 42251251 is 15215224.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42251251 - 2¹⁷ = 42120179 is a prime.

It is a super-2 number, since 2×42251251² = 3570336422130002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42251291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4486 + ... + 10228.

It is an arithmetic number, because the mean of its divisors is an integer number (6042688).

Almost surely, 2^42251251 is an apocalyptic number.

42251251 is a deficient number, since it is larger than the sum of its proper divisors (6090253).

42251251 is a wasteful number, since it uses less digits than its factorization.

42251251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6801.

The product of its digits is 800, while the sum is 22.

The square root of 42251251 is about 6500.0962300569. The cubic root of 42251251 is about 348.2944259304.

Adding to 42251251 its reverse (15215224), we get a palindrome (57466475).

It can be divided in two parts, 4225 and 1251, that added together give a square (5476 = 74²).

The spelling of 42251251 in words is "forty-two million, two hundred fifty-one thousand, two hundred fifty-one".