1156961643 has 16 divisors (see below), whose sum is σ = 1558471200. Its totient is φ = 763395840.

The previous prime is 1156961629. The next prime is 1156961647. The reversal of 1156961643 is 3461696511.

It is not a de Polignac number, because 1156961643 - 2⁹ = 1156961131 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1156961595 and 1156961604.

It is not an unprimeable number, because it can be changed into a prime (1156961647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 483093 + ... + 485481.

It is an arithmetic number, because the mean of its divisors is an integer number (97404450).

Almost surely, 2^1156961643 is an apocalyptic number.

1156961643 is a deficient number, since it is larger than the sum of its proper divisors (401509557).

1156961643 is a wasteful number, since it uses less digits than its factorization.

1156961643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3982.

The product of its digits is 116640, while the sum is 42.

The square root of 1156961643 is about 34014.1388690056. The cubic root of 1156961643 is about 1049.7994002271.

The spelling of 1156961643 in words is "one billion, one hundred fifty-six million, nine hundred sixty-one thousand, six hundred forty-three".