42144457 has 2 divisors, whose sum is σ = 42144458. Its totient is φ = 42144456.

The previous prime is 42144409. The next prime is 42144481. The reversal of 42144457 is 75444124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23386896 + 18757561 = 4836^2 + 4331^2 .

It is a cyclic number.

It is not a de Polignac number, because 42144457 - 2²³ = 33755849 is a prime.

It is equal to p_2555842 and since 42144457 and 2555842 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (42144497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21072228 + 21072229.

It is an arithmetic number, because the mean of its divisors is an integer number (21072229).

Almost surely, 2^42144457 is an apocalyptic number.

It is an amenable number.

42144457 is a deficient number, since it is larger than the sum of its proper divisors (1).

42144457 is an equidigital number, since it uses as much as digits as its factorization.

42144457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17920, while the sum is 31.

The square root of 42144457 is about 6491.8762311061. The cubic root of 42144457 is about 348.0007293991. Note that the first 3 decimals are identical.

The spelling of 42144457 in words is "forty-two million, one hundred forty-four thousand, four hundred fifty-seven".