1145121550 has 24 divisors (see below), whose sum is σ = 2203374600. Its totient is φ = 442253280.

The previous prime is 1145121541. The next prime is 1145121557. The reversal of 1145121550 is 551215411.

It is a super-2 number, since 2×1145121550² = 2622606728548805000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1145121557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 393420 + ... + 396319.

It is an arithmetic number, because the mean of its divisors is an integer number (91807275).

Almost surely, 2^1145121550 is an apocalyptic number.

1145121550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1145121550 is a deficient number, since it is larger than the sum of its proper divisors (1058253050).

1145121550 is a wasteful number, since it uses less digits than its factorization.

1145121550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 789780 (or 789775 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 25.

The square root of 1145121550 is about 33839.6446494345. The cubic root of 1145121550 is about 1046.2059747655.

Adding to 1145121550 its reverse (551215411), we get a palindrome (1696336961).

The spelling of 1145121550 in words is "one billion, one hundred forty-five million, one hundred twenty-one thousand, five hundred fifty".