1291653893 has 2 divisors, whose sum is σ = 1291653894. Its totient is φ = 1291653892.

The previous prime is 1291653799. The next prime is 1291653911. The reversal of 1291653893 is 3983561921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1235733409 + 55920484 = 35153^2 + 7478^2 .

It is an emirp because it is prime and its reverse (3983561921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1291653893 - 2⁸ = 1291653637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1291653793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645826946 + 645826947.

It is an arithmetic number, because the mean of its divisors is an integer number (645826947).

Almost surely, 2^1291653893 is an apocalyptic number.

It is an amenable number.

1291653893 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291653893 is an equidigital number, since it uses as much as digits as its factorization.

1291653893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 349920, while the sum is 47.

The square root of 1291653893 is about 35939.5867115914. The cubic root of 1291653893 is about 1089.0522561729.

The spelling of 1291653893 in words is "one billion, two hundred ninety-one million, six hundred fifty-three thousand, eight hundred ninety-three".