1155232051 has 4 divisors (see below), whose sum is σ = 1156286232. Its totient is φ = 1154177872.

The previous prime is 1155232033. The next prime is 1155232061. The reversal of 1155232051 is 1502325511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1502325511 = 3203 ⋅469037.

It is a cyclic number.

It is not a de Polignac number, because 1155232051 - 2¹¹ = 1155230003 is a prime.

It is a super-2 number, since 2×1155232051² = 2669122183315333202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1155232021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 525445 + ... + 527638.

It is an arithmetic number, because the mean of its divisors is an integer number (289071558).

Almost surely, 2^1155232051 is an apocalyptic number.

1155232051 is a deficient number, since it is larger than the sum of its proper divisors (1054181).

1155232051 is a wasteful number, since it uses less digits than its factorization.

1155232051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1054180.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 1155232051 is about 33988.7047561392. The cubic root of 1155232051 is about 1049.2760091510.

Adding to 1155232051 its reverse (1502325511), we get a palindrome (2657557562).

The spelling of 1155232051 in words is "one billion, one hundred fifty-five million, two hundred thirty-two thousand, fifty-one".