1225366791 has 64 divisors (see below), whose sum is σ = 2021621760. Its totient is φ = 651024000.

The previous prime is 1225366781. The next prime is 1225366801. The reversal of 1225366791 is 1976635221.

It is an interprime number because it is at equal distance from previous prime (1225366781) and next prime (1225366801).

It is not a de Polignac number, because 1225366791 - 2¹³ = 1225358599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225366721) 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 63 ways as a sum of consecutive naturals, for example, 445681 + ... + 448421.

It is an arithmetic number, because the mean of its divisors is an integer number (31587840).

Almost surely, 2^1225366791 is an apocalyptic number.

1225366791 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1225366791 is a deficient number, since it is larger than the sum of its proper divisors (796254969).

1225366791 is a wasteful number, since it uses less digits than its factorization.

1225366791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2828.

The product of its digits is 136080, while the sum is 42.

The square root of 1225366791 is about 35005.2394792551. The cubic root of 1225366791 is about 1070.0942622288.

The spelling of 1225366791 in words is "one billion, two hundred twenty-five million, three hundred sixty-six thousand, seven hundred ninety-one".