1225203101 has 4 divisors (see below), whose sum is σ = 1227849792. Its totient is φ = 1222556412.

The previous prime is 1225203061. The next prime is 1225203137. The reversal of 1225203101 is 1013025221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1225203101 is a prime.

It is a super-2 number, since 2×1225203101² = 3002245277400032402, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1225203101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225203181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1322651 + ... + 1323576.

It is an arithmetic number, because the mean of its divisors is an integer number (306962448).

Almost surely, 2^1225203101 is an apocalyptic number.

It is an amenable number.

1225203101 is a deficient number, since it is larger than the sum of its proper divisors (2646691).

1225203101 is an equidigital number, since it uses as much as digits as its factorization.

1225203101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2646690.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 1225203101 is about 35002.9013226047. The cubic root of 1225203101 is about 1070.0466107741.

Adding to 1225203101 its reverse (1013025221), we get a palindrome (2238228322).

The spelling of 1225203101 in words is "one billion, two hundred twenty-five million, two hundred three thousand, one hundred one".