1225001011 has 16 divisors (see below), whose sum is σ = 1420524000. Its totient is φ = 1046204928.

The previous prime is 1225000957. The next prime is 1225001027. The reversal of 1225001011 is 1101005221.

It is a cyclic number.

It is not a de Polignac number, because 1225001011 - 2⁷ = 1225000883 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1225000982 and 1225001000.

It is not an unprimeable number, because it can be changed into a prime (1225001051) 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, 33936 + ... + 60013.

It is an arithmetic number, because the mean of its divisors is an integer number (88782750).

Almost surely, 2^1225001011 is an apocalyptic number.

1225001011 is a deficient number, since it is larger than the sum of its proper divisors (195522989).

1225001011 is a wasteful number, since it uses less digits than its factorization.

1225001011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94038.

The product of its (nonzero) digits is 20, while the sum is 13.

The square root of 1225001011 is about 35000.0144428542. The cubic root of 1225001011 is about 1069.9877749207.

Adding to 1225001011 its reverse (1101005221), we get a palindrome (2326006232).

The spelling of 1225001011 in words is "one billion, two hundred twenty-five million, one thousand, eleven".