1313121461 has 2 divisors, whose sum is σ = 1313121462. Its totient is φ = 1313121460.

The previous prime is 1313121449. The next prime is 1313121493. The reversal of 1313121461 is 1641213131.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1125267025 + 187854436 = 33545^2 + 13706^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1313121461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1313121661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656560730 + 656560731.

It is an arithmetic number, because the mean of its divisors is an integer number (656560731).

Almost surely, 2^1313121461 is an apocalyptic number.

It is an amenable number.

1313121461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1313121461 is an equidigital number, since it uses as much as digits as its factorization.

1313121461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 23.

The square root of 1313121461 is about 36237.0178270784. The cubic root of 1313121461 is about 1095.0525640759.

Adding to 1313121461 its reverse (1641213131), we get a palindrome (2954334592).

The spelling of 1313121461 in words is "one billion, three hundred thirteen million, one hundred twenty-one thousand, four hundred sixty-one".