775742381 has 4 divisors (see below), whose sum is σ = 775848672. Its totient is φ = 775636092.

The previous prime is 775742347. The next prime is 775742389. The reversal of 775742381 is 183247577.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 183247577 = 347 ⋅528091.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-775742381 is a prime.

It is a super-2 number, since 2×775742381² = 1203552483359098322, 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 (775742389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41321 + ... + 57086.

It is an arithmetic number, because the mean of its divisors is an integer number (193962168).

Almost surely, 2^775742381 is an apocalyptic number.

It is an amenable number.

775742381 is a deficient number, since it is larger than the sum of its proper divisors (106291).

775742381 is an equidigital number, since it uses as much as digits as its factorization.

775742381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106290.

The product of its digits is 329280, while the sum is 44.

The square root of 775742381 is about 27852.1521789610. The cubic root of 775742381 is about 918.8384762712.

The spelling of 775742381 in words is "seven hundred seventy-five million, seven hundred forty-two thousand, three hundred eighty-one".