525621401 has 4 divisors (see below), whose sum is σ = 526792500. Its totient is φ = 524450304.

The previous prime is 525621367. The next prime is 525621457. The reversal of 525621401 is 104126525.

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 337273225 + 188348176 = 18365^2 + 13724^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-525621401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (525621601) 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, 584876 + ... + 585773.

It is an arithmetic number, because the mean of its divisors is an integer number (131698125).

Almost surely, 2^525621401 is an apocalyptic number.

It is an amenable number.

525621401 is a deficient number, since it is larger than the sum of its proper divisors (1171099).

525621401 is a wasteful number, since it uses less digits than its factorization.

525621401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1171098.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 525621401 is about 22926.4345461740. The cubic root of 525621401 is about 807.0324788451.

Adding to 525621401 its reverse (104126525), we get a palindrome (629747926).

The spelling of 525621401 in words is "five hundred twenty-five million, six hundred twenty-one thousand, four hundred one".