869548621 has 2 divisors, whose sum is σ = 869548622. Its totient is φ = 869548620.

The previous prime is 869548613. The next prime is 869548627. The reversal of 869548621 is 126845968.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 511392996 + 358155625 = 22614^2 + 18925^2 .

It is a cyclic number.

It is not a de Polignac number, because 869548621 - 2³ = 869548613 is a prime.

It is a super-2 number, since 2×869548621² = 1512229608566003282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (869548627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434774310 + 434774311.

It is an arithmetic number, because the mean of its divisors is an integer number (434774311).

Almost surely, 2^869548621 is an apocalyptic number.

It is an amenable number.

869548621 is a deficient number, since it is larger than the sum of its proper divisors (1).

869548621 is an equidigital number, since it uses as much as digits as its factorization.

869548621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 829440, while the sum is 49.

The square root of 869548621 is about 29488.1098241308. The cubic root of 869548621 is about 954.4751448387.

The spelling of 869548621 in words is "eight hundred sixty-nine million, five hundred forty-eight thousand, six hundred twenty-one".