1145157555 has 8 divisors (see below), whose sum is σ = 1832252112. Its totient is φ = 610750688.

The previous prime is 1145157551. The next prime is 1145157581. The reversal of 1145157555 is 5557515411.

It is a happy number.

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 1145157555 - 2² = 1145157551 is a prime.

It is a super-2 number, since 2×1145157555² = 2622771651547156050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1145157551) 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, 38171904 + ... + 38171933.

It is an arithmetic number, because the mean of its divisors is an integer number (229031514).

Almost surely, 2^1145157555 is an apocalyptic number.

1145157555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1145157555 is a deficient number, since it is larger than the sum of its proper divisors (687094557).

1145157555 is an equidigital number, since it uses as much as digits as its factorization.

1145157555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76343845.

The product of its digits is 87500, while the sum is 39.

The square root of 1145157555 is about 33840.1766396099. The cubic root of 1145157555 is about 1046.2169396136.

It can be divided in two parts, 11451 and 57555, that added together give a triangular number (69006 = T₃₇₁).

The spelling of 1145157555 in words is "one billion, one hundred forty-five million, one hundred fifty-seven thousand, five hundred fifty-five".