1121815953 has 16 divisors (see below), whose sum is σ = 1666752960. Its totient is φ = 745715808.

The previous prime is 1121815939. The next prime is 1121815957. The reversal of 1121815953 is 3595181211.

It is not a de Polignac number, because 1121815953 - 2¹³ = 1121807761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1121815957) 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, 50500 + ... + 69237.

It is an arithmetic number, because the mean of its divisors is an integer number (104172060).

Almost surely, 2^1121815953 is an apocalyptic number.

It is an amenable number.

1121815953 is a deficient number, since it is larger than the sum of its proper divisors (544937007).

1121815953 is a wasteful number, since it uses less digits than its factorization.

1121815953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120093 (or 120087 counting only the distinct ones).

The product of its digits is 10800, while the sum is 36.

The square root of 1121815953 is about 33493.5210600498. The cubic root of 1121815953 is about 1039.0597866579.

The spelling of 1121815953 in words is "one billion, one hundred twenty-one million, eight hundred fifteen thousand, nine hundred fifty-three".