1125221911 has 32 divisors (see below), whose sum is σ = 1315731456. Its totient is φ = 952560000.

The previous prime is 1125221899. The next prime is 1125221941. The reversal of 1125221911 is 1191225211.

It is a cyclic number.

It is not a de Polignac number, because 1125221911 - 2²³ = 1116833303 is a prime.

It is a super-2 number, since 2×1125221911² = 2532248697988983842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1125221941) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1273876 + ... + 1274758.

It is an arithmetic number, because the mean of its divisors is an integer number (41116608).

Almost surely, 2^1125221911 is an apocalyptic number.

1125221911 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1125221911 is a deficient number, since it is larger than the sum of its proper divisors (190509545).

1125221911 is a wasteful number, since it uses less digits than its factorization.

1125221911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063.

The product of its digits is 360, while the sum is 25.

The square root of 1125221911 is about 33544.3275532541. The cubic root of 1125221911 is about 1040.1102912495.

The spelling of 1125221911 in words is "one billion, one hundred twenty-five million, two hundred twenty-one thousand, nine hundred eleven".