945989491 has 2 divisors, whose sum is σ = 945989492. Its totient is φ = 945989490.

The previous prime is 945989437. The next prime is 945989507. The reversal of 945989491 is 194989549.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 945989491 - 2¹¹ = 945987443 is a prime.

It is a super-2 number, since 2×945989491² = 1789792234164878162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (945989791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 472994745 + 472994746.

It is an arithmetic number, because the mean of its divisors is an integer number (472994746).

Almost surely, 2^945989491 is an apocalyptic number.

945989491 is a deficient number, since it is larger than the sum of its proper divisors (1).

945989491 is an equidigital number, since it uses as much as digits as its factorization.

945989491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4199040, while the sum is 58.

The square root of 945989491 is about 30756.9421594540. The cubic root of 945989491 is about 981.6622805316.

Adding to 945989491 its sum of digits (58), we get a palindrome (945989549).

The spelling of 945989491 in words is "nine hundred forty-five million, nine hundred eighty-nine thousand, four hundred ninety-one".