1155230121 has 16 divisors (see below), whose sum is σ = 1631608704. Its totient is φ = 724541184.

The previous prime is 1155230107. The next prime is 1155230123. The reversal of 1155230121 is 1210325511.

It is not a de Polignac number, because 1155230121 - 2¹³ = 1155221929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1155230123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 201531 + ... + 207183.

It is an arithmetic number, because the mean of its divisors is an integer number (101975544).

Almost surely, 2^1155230121 is an apocalyptic number.

It is an amenable number.

1155230121 is a deficient number, since it is larger than the sum of its proper divisors (476378583).

1155230121 is a wasteful number, since it uses less digits than its factorization.

1155230121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9680.

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 1155230121 is about 33988.6763643423. The cubic root of 1155230121 is about 1049.2754248228.

Adding to 1155230121 its reverse (1210325511), we get a palindrome (2365555632).

The spelling of 1155230121 in words is "one billion, one hundred fifty-five million, two hundred thirty thousand, one hundred twenty-one".