42251425 has 6 divisors (see below), whose sum is σ = 52391798. Its totient is φ = 33801120.

The previous prime is 42251423. The next prime is 42251453. The reversal of 42251425 is 52415224.

It can be written as a sum of positive squares in 3 ways, for example, as 6155361 + 36096064 = 2481^2 + 6008^2 .

It is not a de Polignac number, because 42251425 - 2¹ = 42251423 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 1690057 = 42251425 / (4 + 2 + 2 + 5 + 1 + 4 + 2 + 5).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42251425.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42251423) 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, 845004 + ... + 845053.

Almost surely, 2^42251425 is an apocalyptic number.

It is an amenable number.

42251425 is a deficient number, since it is larger than the sum of its proper divisors (10140373).

42251425 is a wasteful number, since it uses less digits than its factorization.

42251425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1690067 (or 1690062 counting only the distinct ones).

The product of its digits is 3200, while the sum is 25.

The square root of 42251425 is about 6500.1096144604. The cubic root of 42251425 is about 348.2949040476.

Adding to 42251425 its reverse (52415224), we get a palindrome (94666649).

The spelling of 42251425 in words is "forty-two million, two hundred fifty-one thousand, four hundred twenty-five".