1343777557 has 2 divisors, whose sum is σ = 1343777558. Its totient is φ = 1343777556.

The previous prime is 1343777551. The next prime is 1343777579. The reversal of 1343777557 is 7557773431.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1342929316 + 848241 = 36646^2 + 921^2 .

It is a cyclic number.

It is not a de Polignac number, because 1343777557 - 2¹⁵ = 1343744789 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1343777557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1343777551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 671888778 + 671888779.

It is an arithmetic number, because the mean of its divisors is an integer number (671888779).

Almost surely, 2^1343777557 is an apocalyptic number.

It is an amenable number.

1343777557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1343777557 is an equidigital number, since it uses as much as digits as its factorization.

1343777557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160900, while the sum is 49.

The square root of 1343777557 is about 36657.5716189712. The cubic root of 1343777557 is about 1103.5087839224.

The spelling of 1343777557 in words is "one billion, three hundred forty-three million, seven hundred seventy-seven thousand, five hundred fifty-seven".