601189991 has 2 divisors, whose sum is σ = 601189992. Its totient is φ = 601189990.

The previous prime is 601189969. The next prime is 601189993. The reversal of 601189991 is 199981106.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 601189991 - 2¹⁰ = 601188967 is a prime.

It is a super-2 number, since 2×601189991² = 722858810557160162, which contains 22 as substring.

Together with 601189993, 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 (601189993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 300594995 + 300594996.

It is an arithmetic number, because the mean of its divisors is an integer number (300594996).

Almost surely, 2^601189991 is an apocalyptic number.

601189991 is a deficient number, since it is larger than the sum of its proper divisors (1).

601189991 is an equidigital number, since it uses as much as digits as its factorization.

601189991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 44.

The square root of 601189991 is about 24519.1759853385. The cubic root of 601189991 is about 843.9898955650.

The spelling of 601189991 in words is "six hundred one million, one hundred eighty-nine thousand, nine hundred ninety-one".