1291104557 has 2 divisors, whose sum is σ = 1291104558. Its totient is φ = 1291104556.

The previous prime is 1291104553. The next prime is 1291104583. The reversal of 1291104557 is 7554011921.

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., 956726761 + 334377796 = 30931^2 + 18286^2 .

It is a cyclic number.

It is not a de Polignac number, because 1291104557 - 2² = 1291104553 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1291104553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645552278 + 645552279.

It is an arithmetic number, because the mean of its divisors is an integer number (645552279).

Almost surely, 2^1291104557 is an apocalyptic number.

It is an amenable number.

1291104557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291104557 is an equidigital number, since it uses as much as digits as its factorization.

1291104557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12600, while the sum is 35.

The square root of 1291104557 is about 35931.9434069464. The cubic root of 1291104557 is about 1088.8978442092.

The spelling of 1291104557 in words is "one billion, two hundred ninety-one million, one hundred four thousand, five hundred fifty-seven".