745291991 has 2 divisors, whose sum is σ = 745291992. Its totient is φ = 745291990.

The previous prime is 745291979. The next prime is 745292003. The reversal of 745291991 is 199192547.

It is a balanced prime because it is at equal distance from previous prime (745291979) and next prime (745292003).

It is an emirp because it is prime and its reverse (199192547) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-745291991 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (745291901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 372645995 + 372645996.

It is an arithmetic number, because the mean of its divisors is an integer number (372645996).

Almost surely, 2^745291991 is an apocalyptic number.

745291991 is a deficient number, since it is larger than the sum of its proper divisors (1).

745291991 is an equidigital number, since it uses as much as digits as its factorization.

745291991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 47.

The square root of 745291991 is about 27300.0364651771. The cubic root of 745291991 is about 906.6551889196.

The spelling of 745291991 in words is "seven hundred forty-five million, two hundred ninety-one thousand, nine hundred ninety-one".