1155700121 has 4 divisors (see below), whose sum is σ = 1182576912. Its totient is φ = 1128823332.

The previous prime is 1155700037. The next prime is 1155700123. The reversal of 1155700121 is 1210075511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1155700121 - 2¹⁸ = 1155437977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1155700123) 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, 13438331 + ... + 13438416.

It is an arithmetic number, because the mean of its divisors is an integer number (295644228).

Almost surely, 2^1155700121 is an apocalyptic number.

It is an amenable number.

1155700121 is a deficient number, since it is larger than the sum of its proper divisors (26876791).

1155700121 is an equidigital number, since it uses as much as digits as its factorization.

1155700121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26876790.

The product of its (nonzero) digits is 350, while the sum is 23.

The square root of 1155700121 is about 33995.5897286692. The cubic root of 1155700121 is about 1049.4177031377.

Adding to 1155700121 its reverse (1210075511), we get a palindrome (2365775632).

The spelling of 1155700121 in words is "one billion, one hundred fifty-five million, seven hundred thousand, one hundred twenty-one".