869693021 has 4 divisors (see below), whose sum is σ = 920851452. Its totient is φ = 818534592.

The previous prime is 869693009. The next prime is 869693047. The reversal of 869693021 is 120396968.

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 403608100 + 466084921 = 20090^2 + 21589^2 .

It is a cyclic number.

It is not a de Polignac number, because 869693021 - 2¹⁴ = 869676637 is a prime.

It is a super-2 number, since 2×869693021² = 1512731901552212882, 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 (869693051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25579190 + ... + 25579223.

It is an arithmetic number, because the mean of its divisors is an integer number (230212863).

Almost surely, 2^869693021 is an apocalyptic number.

It is an amenable number.

869693021 is a deficient number, since it is larger than the sum of its proper divisors (51158431).

869693021 is a wasteful number, since it uses less digits than its factorization.

869693021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51158430.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 869693021 is about 29490.5581669795. The cubic root of 869693021 is about 954.5279763036.

The spelling of 869693021 in words is "eight hundred sixty-nine million, six hundred ninety-three thousand, twenty-one".