675547991 has 2 divisors, whose sum is σ = 675547992. Its totient is φ = 675547990.

The previous prime is 675547937. The next prime is 675547993. The reversal of 675547991 is 199745576.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-675547991 is a prime.

Together with 675547993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (675547993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 337773995 + 337773996.

It is an arithmetic number, because the mean of its divisors is an integer number (337773996).

Almost surely, 2^675547991 is an apocalyptic number.

675547991 is a deficient number, since it is larger than the sum of its proper divisors (1).

675547991 is an equidigital number, since it uses as much as digits as its factorization.

675547991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2381400, while the sum is 53.

The square root of 675547991 is about 25991.3060656828. The cubic root of 675547991 is about 877.4426402768.

The spelling of 675547991 in words is "six hundred seventy-five million, five hundred forty-seven thousand, nine hundred ninety-one".