775220242 has 4 divisors (see below), whose sum is σ = 1162830366. Its totient is φ = 387610120.

The previous prime is 775220239. The next prime is 775220261. The reversal of 775220242 is 242022577.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 242022577 = 197 ⋅1228541.

It can be written as a sum of positive squares in only one way, i.e., 774008041 + 1212201 = 27821^2 + 1101^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193805059 + ... + 193805062.

Almost surely, 2^775220242 is an apocalyptic number.

775220242 is a deficient number, since it is larger than the sum of its proper divisors (387610124).

775220242 is a wasteful number, since it uses less digits than its factorization.

775220242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387610123.

The product of its (nonzero) digits is 15680, while the sum is 31.

The square root of 775220242 is about 27842.7771962497. Note that the first 3 decimals coincide. The cubic root of 775220242 is about 918.6322784858.

The spelling of 775220242 in words is "seven hundred seventy-five million, two hundred twenty thousand, two hundred forty-two".