775225138 has 4 divisors (see below), whose sum is σ = 1162837710. Its totient is φ = 387612568.

The previous prime is 775225127. The next prime is 775225151. The reversal of 775225138 is 831522577.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 415629769 + 359595369 = 20387^2 + 18963^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 775225138.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193806283 + ... + 193806286.

Almost surely, 2^775225138 is an apocalyptic number.

775225138 is a deficient number, since it is larger than the sum of its proper divisors (387612572).

775225138 is a wasteful number, since it uses less digits than its factorization.

775225138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387612571.

The product of its digits is 117600, while the sum is 40.

The square root of 775225138 is about 27842.8651183746. The cubic root of 775225138 is about 918.6342123939.

The spelling of 775225138 in words is "seven hundred seventy-five million, two hundred twenty-five thousand, one hundred thirty-eight".