1965549491 has 2 divisors, whose sum is σ = 1965549492. Its totient is φ = 1965549490.

The previous prime is 1965549457. The next prime is 1965549511. The reversal of 1965549491 is 1949455691.

It is a strong prime.

It is an emirp because it is prime and its reverse (1949455691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1965549491 - 2⁶ = 1965549427 is a prime.

It is a super-3 number, since 3×1965549491³ (a number of 29 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1965549191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 982774745 + 982774746.

It is an arithmetic number, because the mean of its divisors is an integer number (982774746).

Almost surely, 2^1965549491 is an apocalyptic number.

1965549491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1965549491 is an equidigital number, since it uses as much as digits as its factorization.

1965549491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1749600, while the sum is 53.

The square root of 1965549491 is about 44334.5180530927. The cubic root of 1965549491 is about 1252.6449574925.

The spelling of 1965549491 in words is "one billion, nine hundred sixty-five million, five hundred forty-nine thousand, four hundred ninety-one".