1217387461 has 2 divisors, whose sum is σ = 1217387462. Its totient is φ = 1217387460.

The previous prime is 1217387429. The next prime is 1217387473. The reversal of 1217387461 is 1647837121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1128556836 + 88830625 = 33594^2 + 9425^2 .

It is a cyclic number.

It is not a de Polignac number, because 1217387461 - 2⁵ = 1217387429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1217387411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608693730 + 608693731.

It is an arithmetic number, because the mean of its divisors is an integer number (608693731).

Almost surely, 2^1217387461 is an apocalyptic number.

It is an amenable number.

1217387461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1217387461 is an equidigital number, since it uses as much as digits as its factorization.

1217387461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 40.

The square root of 1217387461 is about 34891.0799632227. The cubic root of 1217387461 is about 1067.7664594885.

The spelling of 1217387461 in words is "one billion, two hundred seventeen million, three hundred eighty-seven thousand, four hundred sixty-one".