1225917127 has 4 divisors (see below), whose sum is σ = 1226036736. Its totient is φ = 1225797520.

The previous prime is 1225917079. The next prime is 1225917131. The reversal of 1225917127 is 7217195221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7217195221 = 14737 ⋅489733.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1225917127 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 (1225917727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42823 + ... + 65464.

It is an arithmetic number, because the mean of its divisors is an integer number (306509184).

Almost surely, 2^1225917127 is an apocalyptic number.

1225917127 is a deficient number, since it is larger than the sum of its proper divisors (119609).

1225917127 is a wasteful number, since it uses less digits than its factorization.

1225917127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119608.

The product of its digits is 17640, while the sum is 37.

The square root of 1225917127 is about 35013.0993629527. The cubic root of 1225917127 is about 1070.2544382834.

The spelling of 1225917127 in words is "one billion, two hundred twenty-five million, nine hundred seventeen thousand, one hundred twenty-seven".