775316421 has 32 divisors (see below), whose sum is σ = 1296259200. Its totient is φ = 453680640.

The previous prime is 775316411. The next prime is 775316449. The reversal of 775316421 is 124613577.

It is a happy number.

775316421 is a `hidden beast` number, since 7 + 7 + 5 + 3 + 1 + 642 + 1 = 666.

It is not a de Polignac number, because 775316421 - 2⁶ = 775316357 is a prime.

It is a super-2 number, since 2×775316421² = 1202231105344498482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (775316411) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36396 + ... + 53621.

It is an arithmetic number, because the mean of its divisors is an integer number (40508100).

Almost surely, 2^775316421 is an apocalyptic number.

It is an amenable number.

775316421 is a deficient number, since it is larger than the sum of its proper divisors (520942779).

775316421 is a wasteful number, since it uses less digits than its factorization.

775316421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90066 (or 90060 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 775316421 is about 27844.5043231155. The cubic root of 775316421 is about 918.6702674664.

Adding to 775316421 its reverse (124613577), we get a palindrome (899929998).

The spelling of 775316421 in words is "seven hundred seventy-five million, three hundred sixteen thousand, four hundred twenty-one".