1155861005 has 8 divisors (see below), whose sum is σ = 1493728152. Its totient is φ = 853558848.

The previous prime is 1155860999. The next prime is 1155861011. The reversal of 1155861005 is 5001685511.

It is an interprime number because it is at equal distance from previous prime (1155860999) and next prime (1155861011).

It can be written as a sum of positive squares in 4 ways, for example, as 25623844 + 1130237161 = 5062^2 + 33619^2 .

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 1155861005 - 2⁸ = 1155860749 is a prime.

It is a super-2 number, since 2×1155861005² = 2672029325759220050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8891174 + ... + 8891303.

It is an arithmetic number, because the mean of its divisors is an integer number (186716019).

Almost surely, 2^1155861005 is an apocalyptic number.

It is an amenable number.

1155861005 is a deficient number, since it is larger than the sum of its proper divisors (337867147).

1155861005 is a wasteful number, since it uses less digits than its factorization.

1155861005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17782495.

The product of its (nonzero) digits is 6000, while the sum is 32.

The square root of 1155861005 is about 33997.9558944358. The cubic root of 1155861005 is about 1049.4663970509.

The spelling of 1155861005 in words is "one billion, one hundred fifty-five million, eight hundred sixty-one thousand, five".