969399421 has 2 divisors, whose sum is σ = 969399422. Its totient is φ = 969399420.

The previous prime is 969399407. The next prime is 969399451. The reversal of 969399421 is 124993969.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 947962521 + 21436900 = 30789^2 + 4630^2 .

It is an emirp because it is prime and its reverse (124993969) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 969399421 - 2⁷ = 969399293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (969399401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 484699710 + 484699711.

It is an arithmetic number, because the mean of its divisors is an integer number (484699711).

Almost surely, 2^969399421 is an apocalyptic number.

It is an amenable number.

969399421 is a deficient number, since it is larger than the sum of its proper divisors (1).

969399421 is an equidigital number, since it uses as much as digits as its factorization.

969399421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 944784, while the sum is 52.

The square root of 969399421 is about 31135.1797971362. The cubic root of 969399421 is about 989.6939573691.

It can be divided in two parts, 96939 and 9421, that multiplied together give a palindrome (913262319).

The spelling of 969399421 in words is "nine hundred sixty-nine million, three hundred ninety-nine thousand, four hundred twenty-one".