1121265157 has 16 divisors (see below), whose sum is σ = 1189859328. Its totient is φ = 1054413360.

The previous prime is 1121265149. The next prime is 1121265169. The reversal of 1121265157 is 7515621211.

It is a cyclic number.

It is not a de Polignac number, because 1121265157 - 2³ = 1121265149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121260157) 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, 755338 + ... + 756820.

It is an arithmetic number, because the mean of its divisors is an integer number (74366208).

Almost surely, 2^1121265157 is an apocalyptic number.

It is an amenable number.

1121265157 is a deficient number, since it is larger than the sum of its proper divisors (68594171).

1121265157 is a wasteful number, since it uses less digits than its factorization.

1121265157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2040.

The product of its digits is 4200, while the sum is 31.

The square root of 1121265157 is about 33485.2976244799. The cubic root of 1121265157 is about 1038.8897041937.

Adding to 1121265157 its reverse (7515621211), we get a palindrome (8636886368).

The spelling of 1121265157 in words is "one billion, one hundred twenty-one million, two hundred sixty-five thousand, one hundred fifty-seven".