1555679 has 2 divisors, whose sum is σ = 1555680. Its totient is φ = 1555678.

The previous prime is 1555661. The next prime is 1555691. The reversal of 1555679 is 9765551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1555679 - 2⁸ = 1555423 is a prime.

It is a Chen prime.

It is a plaindrome in base 10 and base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1555639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777839 + 777840.

It is an arithmetic number, because the mean of its divisors is an integer number (777840).

2^1555679 is an apocalyptic number.

1555679 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555679 is an equidigital number, since it uses as much as digits as its factorization.

1555679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47250, while the sum is 38.

The square root of 1555679 is about 1247.2686158162. The cubic root of 1555679 is about 115.8706197212.

The spelling of 1555679 in words is "one million, five hundred fifty-five thousand, six hundred seventy-nine".