1825687621 has 4 divisors (see below), whose sum is σ = 1825847244. Its totient is φ = 1825528000.

The previous prime is 1825687609. The next prime is 1825687631. The reversal of 1825687621 is 1267865281.

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 883872900 + 941814721 = 29730^2 + 30689^2 .

It is a cyclic number.

It is not a de Polignac number, because 1825687621 - 2⁹ = 1825687109 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 (1825687631) 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, 61210 + ... + 86011.

It is an arithmetic number, because the mean of its divisors is an integer number (456461811).

Almost surely, 2^1825687621 is an apocalyptic number.

It is an amenable number.

1825687621 is a deficient number, since it is larger than the sum of its proper divisors (159623).

1825687621 is a wasteful number, since it uses less digits than its factorization.

1825687621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159622.

The product of its digits is 322560, while the sum is 46.

The square root of 1825687621 is about 42728.0659637199. The cubic root of 1825687621 is about 1222.1996554477.

The spelling of 1825687621 in words is "one billion, eight hundred twenty-five million, six hundred eighty-seven thousand, six hundred twenty-one".