1125121005 has 24 divisors (see below), whose sum is σ = 2052853920. Its totient is φ = 568481760.

The previous prime is 1125120977. The next prime is 1125121031. The reversal of 1125121005 is 5001215211.

It is not a de Polignac number, because 1125121005 - 2¹⁶ = 1125055469 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 657111 + ... + 658820.

It is an arithmetic number, because the mean of its divisors is an integer number (85535580).

Almost surely, 2^1125121005 is an apocalyptic number.

1125121005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1125121005 is a deficient number, since it is larger than the sum of its proper divisors (927732915).

1125121005 is a wasteful number, since it uses less digits than its factorization.

1125121005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1315961 (or 1315958 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 18.

The square root of 1125121005 is about 33542.8234500318. The cubic root of 1125121005 is about 1040.0791991584.

Adding to 1125121005 its reverse (5001215211), we get a palindrome (6126336216).

The spelling of 1125121005 in words is "one billion, one hundred twenty-five million, one hundred twenty-one thousand, five".