525412421 has 4 divisors (see below), whose sum is σ = 556319052. Its totient is φ = 494505792.

The previous prime is 525412409. The next prime is 525412427. The reversal of 525412421 is 124214525.

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 469372225 + 56040196 = 21665^2 + 7486^2 .

It is a de Polignac number, because none of the positive numbers 2^k-525412421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (525412427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15453290 + ... + 15453323.

It is an arithmetic number, because the mean of its divisors is an integer number (139079763).

Almost surely, 2^525412421 is an apocalyptic number.

It is an amenable number.

525412421 is a deficient number, since it is larger than the sum of its proper divisors (30906631).

525412421 is a wasteful number, since it uses less digits than its factorization.

525412421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30906630.

The product of its digits is 3200, while the sum is 26.

The square root of 525412421 is about 22921.8764720518. The cubic root of 525412421 is about 806.9255095807.

Adding to 525412421 its reverse (124214525), we get a palindrome (649626946).

The spelling of 525412421 in words is "five hundred twenty-five million, four hundred twelve thousand, four hundred twenty-one".