825742621 has 4 divisors (see below), whose sum is σ = 900810144. Its totient is φ = 750675100.

The previous prime is 825742613. The next prime is 825742651. The reversal of 825742621 is 126247528.

It is a happy number.

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 825742621 - 2³ = 825742613 is a prime.

It is a super-2 number, since 2×825742621² = 1363701752271899282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (825742651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37533745 + ... + 37533766.

It is an arithmetic number, because the mean of its divisors is an integer number (225202536).

Almost surely, 2^825742621 is an apocalyptic number.

It is an amenable number.

825742621 is a deficient number, since it is larger than the sum of its proper divisors (75067523).

825742621 is a wasteful number, since it uses less digits than its factorization.

825742621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75067522.

The product of its digits is 53760, while the sum is 37.

The square root of 825742621 is about 28735.7376971603. The cubic root of 825742621 is about 938.1700557588.

The spelling of 825742621 in words is "eight hundred twenty-five million, seven hundred forty-two thousand, six hundred twenty-one".