1161981567 has 6 divisors (see below), whose sum is σ = 1678417832. Its totient is φ = 774654372.

The previous prime is 1161981563. The next prime is 1161981581. The reversal of 1161981567 is 7651891611.

1161981567 is a `hidden beast` number, since 1 + 1 + 6 + 1 + 9 + 81 + 567 = 666.

It is not a de Polignac number, because 1161981567 - 2² = 1161981563 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161981563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 64554523 + ... + 64554540.

Almost surely, 2^1161981567 is an apocalyptic number.

1161981567 is a deficient number, since it is larger than the sum of its proper divisors (516436265).

1161981567 is a wasteful number, since it uses less digits than its factorization.

1161981567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129109069 (or 129109066 counting only the distinct ones).

The product of its digits is 90720, while the sum is 45.

The square root of 1161981567 is about 34087.8507242683. The cubic root of 1161981567 is about 1051.3155293359.

The spelling of 1161981567 in words is "one billion, one hundred sixty-one million, nine hundred eighty-one thousand, five hundred sixty-seven".