42249261 has 16 divisors (see below), whose sum is σ = 57689216. Its totient is φ = 27495936.

The previous prime is 42249257. The next prime is 42249269. The reversal of 42249261 is 16294224.

It is not a de Polignac number, because 42249261 - 2² = 42249257 is a prime.

It is a super-2 number, since 2×42249261² = 3570000110092242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42249269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21621 + ... + 23493.

It is an arithmetic number, because the mean of its divisors is an integer number (3605576).

Almost surely, 2^42249261 is an apocalyptic number.

It is an amenable number.

42249261 is a deficient number, since it is larger than the sum of its proper divisors (15439955).

42249261 is a wasteful number, since it uses less digits than its factorization.

42249261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2052.

The product of its digits is 6912, while the sum is 30.

The square root of 42249261 is about 6499.9431535976. The cubic root of 42249261 is about 348.2889577153.

The spelling of 42249261 in words is "forty-two million, two hundred forty-nine thousand, two hundred sixty-one".