1145518781 has 8 divisors (see below), whose sum is σ = 1261337184. Its totient is φ = 1031647120.

The previous prime is 1145518747. The next prime is 1145518793. The reversal of 1145518781 is 1878155411.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1145518781 - 2¹⁰ = 1145517757 is a prime.

It is a super-2 number, since 2×1145518781² = 2624426555247451922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1145518711) 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, 485450 + ... + 487803.

It is an arithmetic number, because the mean of its divisors is an integer number (157667148).

Almost surely, 2^1145518781 is an apocalyptic number.

1145518781 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1145518781 is a deficient number, since it is larger than the sum of its proper divisors (115818403).

1145518781 is a wasteful number, since it uses less digits than its factorization.

1145518781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 973371.

The product of its digits is 44800, while the sum is 41.

The square root of 1145518781 is about 33845.5134545186. The cubic root of 1145518781 is about 1046.3269335117.

The spelling of 1145518781 in words is "one billion, one hundred forty-five million, five hundred eighteen thousand, seven hundred eighty-one".