1145021556 has 24 divisors (see below), whose sum is σ = 3053391040. Its totient is φ = 327148992.

The previous prime is 1145021551. The next prime is 1145021557. The reversal of 1145021556 is 6551205411.

It is a super-2 number, since 2×1145021556² = 2622148727409322272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1145021551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6815521 + ... + 6815688.

Almost surely, 2^1145021556 is an apocalyptic number.

It is an amenable number.

1145021556 is an abundant number, since it is smaller than the sum of its proper divisors (1908369484).

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

1145021556 is a wasteful number, since it uses less digits than its factorization.

1145021556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13631223 (or 13631221 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 30.

The square root of 1145021556 is about 33838.1671489459. The cubic root of 1145021556 is about 1046.1755217057.

Adding to 1145021556 its reverse (6551205411), we get a palindrome (7696226967).

The spelling of 1145021556 in words is "one billion, one hundred forty-five million, twenty-one thousand, five hundred fifty-six".