525556381 has 4 divisors (see below), whose sum is σ = 600635872. Its totient is φ = 450476892.

The previous prime is 525556349. The next prime is 525556387. The reversal of 525556381 is 183655525.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 525556381 - 2⁵ = 525556349 is a prime.

It is a super-4 number, since 4×525556381⁴ (a number of 36 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (525556387) 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, 37539735 + ... + 37539748.

It is an arithmetic number, because the mean of its divisors is an integer number (150158968).

Almost surely, 2^525556381 is an apocalyptic number.

It is an amenable number.

525556381 is a deficient number, since it is larger than the sum of its proper divisors (75079491).

525556381 is an equidigital number, since it uses as much as digits as its factorization.

525556381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75079490.

The product of its digits is 180000, while the sum is 40.

The square root of 525556381 is about 22925.0164885437. The cubic root of 525556381 is about 806.9992005098. Note that the first 3 decimals are identical.

The spelling of 525556381 in words is "five hundred twenty-five million, five hundred fifty-six thousand, three hundred eighty-one".