1225917131 has 2 divisors, whose sum is σ = 1225917132. Its totient is φ = 1225917130.

The previous prime is 1225917079. The next prime is 1225917193. The reversal of 1225917131 is 1317195221.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1225917131 - 2⁶ = 1225917067 is a prime.

It is a super-2 number, since 2×1225917131² = 3005745624158542322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1225910131) 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 as a sum of consecutive naturals, namely, 612958565 + 612958566.

It is an arithmetic number, because the mean of its divisors is an integer number (612958566).

Almost surely, 2^1225917131 is an apocalyptic number.

1225917131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225917131 is an equidigital number, since it uses as much as digits as its factorization.

1225917131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3780, while the sum is 32.

The square root of 1225917131 is about 35013.0994200742. The cubic root of 1225917131 is about 1070.2544394474.

The spelling of 1225917131 in words is "one billion, two hundred twenty-five million, nine hundred seventeen thousand, one hundred thirty-one".