1145981556 has 36 divisors (see below), whose sum is σ = 2923869312. Its totient is φ = 378422544.

The previous prime is 1145981549. The next prime is 1145981587. The reversal of 1145981556 is 6551895411.

1145981556 is a `hidden beast` number, since 1 + 1 + 4 + 5 + 98 + 1 + 556 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×1145981556² = 2626547453384362272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 144900 + ... + 152603.

It is an arithmetic number, because the mean of its divisors is an integer number (81218592).

Almost surely, 2^1145981556 is an apocalyptic number.

It is an amenable number.

1145981556 is an abundant number, since it is smaller than the sum of its proper divisors (1777887756).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1145981556 is a wasteful number, since it uses less digits than its factorization.

1145981556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297620 (or 297615 counting only the distinct ones).

The product of its digits is 216000, while the sum is 45.

The square root of 1145981556 is about 33852.3493424016. The cubic root of 1145981556 is about 1046.4678154608.

The spelling of 1145981556 in words is "one billion, one hundred forty-five million, nine hundred eighty-one thousand, five hundred fifty-six".