42510401 has 4 divisors (see below), whose sum is σ = 42528900. Its totient is φ = 42491904.

The previous prime is 42510397. The next prime is 42510407. The reversal of 42510401 is 10401524.

It is a Cunningham number, because it is equal to 6520²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1537600 + 40972801 = 1240^2 + 6401^2 .

It is a cyclic number.

It is not a de Polignac number, because 42510401 - 2² = 42510397 is a prime.

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 42510401.

It is not an unprimeable number, because it can be changed into a prime (42510407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5216 + ... + 10593.

It is an arithmetic number, because the mean of its divisors is an integer number (10632225).

Almost surely, 2^42510401 is an apocalyptic number.

It is an amenable number.

42510401 is a deficient number, since it is larger than the sum of its proper divisors (18499).

42510401 is a wasteful number, since it uses less digits than its factorization.

42510401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18498.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 42510401 is about 6520.0000766871. Note that the first 4 decimals coincide. The cubic root of 42510401 is about 349.0050683030.

Adding to 42510401 its reverse (10401524), we get a palindrome (52911925).

The spelling of 42510401 in words is "forty-two million, five hundred ten thousand, four hundred one".