775140391 has 4 divisors (see below), whose sum is σ = 801869400. Its totient is φ = 748411384.

The previous prime is 775140389. The next prime is 775140413. The reversal of 775140391 is 193041577.

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

It is a cyclic number.

It is not a de Polignac number, because 775140391 - 2¹ = 775140389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 775140391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (775140371) 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, 13364461 + ... + 13364518.

It is an arithmetic number, because the mean of its divisors is an integer number (200467350).

Almost surely, 2^775140391 is an apocalyptic number.

775140391 is a deficient number, since it is larger than the sum of its proper divisors (26729009).

775140391 is a wasteful number, since it uses less digits than its factorization.

775140391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26729008.

The product of its (nonzero) digits is 26460, while the sum is 37.

The square root of 775140391 is about 27841.3431967641. The cubic root of 775140391 is about 918.6007363851.

The spelling of 775140391 in words is "seven hundred seventy-five million, one hundred forty thousand, three hundred ninety-one".