1225144491 has 32 divisors (see below), whose sum is σ = 1842704640. Its totient is φ = 719437824.

The previous prime is 1225144477. The next prime is 1225144537. The reversal of 1225144491 is 1944415221.

It is not a de Polignac number, because 1225144491 - 2¹³ = 1225136299 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1225144451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72811 + ... + 88043.

It is an arithmetic number, because the mean of its divisors is an integer number (57584520).

Almost surely, 2^1225144491 is an apocalyptic number.

1225144491 is a deficient number, since it is larger than the sum of its proper divisors (617560149).

1225144491 is a wasteful number, since it uses less digits than its factorization.

1225144491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15355.

The product of its digits is 11520, while the sum is 33.

The square root of 1225144491 is about 35002.0640962787. The cubic root of 1225144491 is about 1070.0295479074.

The spelling of 1225144491 in words is "one billion, two hundred twenty-five million, one hundred forty-four thousand, four hundred ninety-one".