13770557 has 2 divisors, whose sum is σ = 13770558. Its totient is φ = 13770556.

The previous prime is 13770553. The next prime is 13770571. The reversal of 13770557 is 75507731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9665881 + 4104676 = 3109^2 + 2026^2 .

It is a cyclic number.

It is not a de Polignac number, because 13770557 - 2² = 13770553 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13770553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6885278 + 6885279.

It is an arithmetic number, because the mean of its divisors is an integer number (6885279).

Almost surely, 2^13770557 is an apocalyptic number.

It is an amenable number.

13770557 is a deficient number, since it is larger than the sum of its proper divisors (1).

13770557 is an equidigital number, since it uses as much as digits as its factorization.

13770557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25725, while the sum is 35.

The square root of 13770557 is about 3710.8701135987. The cubic root of 13770557 is about 239.6903239713.

The spelling of 13770557 in words is "thirteen million, seven hundred seventy thousand, five hundred fifty-seven".