1155645057 has 24 divisors (see below), whose sum is σ = 1897870176. Its totient is φ = 621522048.

The previous prime is 1155645031. The next prime is 1155645059. The reversal of 1155645057 is 7505465511.

It is a happy number.

It is not a de Polignac number, because 1155645057 - 2¹¹ = 1155643009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1155645059) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 228723 + ... + 233720.

It is an arithmetic number, because the mean of its divisors is an integer number (79077924).

Almost surely, 2^1155645057 is an apocalyptic number.

1155645057 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1155645057 is a deficient number, since it is larger than the sum of its proper divisors (742225119).

1155645057 is a wasteful number, since it uses less digits than its factorization.

1155645057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462477 (or 462470 counting only the distinct ones).

The product of its (nonzero) digits is 105000, while the sum is 39.

The square root of 1155645057 is about 33994.7798492651. The cubic root of 1155645057 is about 1049.4010361688.

The spelling of 1155645057 in words is "one billion, one hundred fifty-five million, six hundred forty-five thousand, fifty-seven".