742771991 has 4 divisors (see below), whose sum is σ = 799908312. Its totient is φ = 685635672.

The previous prime is 742771987. The next prime is 742772011. The reversal of 742771991 is 199177247.

It is a happy number.

742771991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 742771991 - 2² = 742771987 is a prime.

It is a super-2 number, since 2×742771991² = 1103420461228208162, 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 (742771951) 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, 28568141 + ... + 28568166.

It is an arithmetic number, because the mean of its divisors is an integer number (199977078).

Almost surely, 2^742771991 is an apocalyptic number.

742771991 is a deficient number, since it is larger than the sum of its proper divisors (57136321).

742771991 is a wasteful number, since it uses less digits than its factorization.

742771991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57136320.

The product of its digits is 222264, while the sum is 47.

The square root of 742771991 is about 27253.8436004906. The cubic root of 742771991 is about 905.6321665962.

The spelling of 742771991 in words is "seven hundred forty-two million, seven hundred seventy-one thousand, nine hundred ninety-one".