1357661 has 2 divisors, whose sum is σ = 1357662. Its totient is φ = 1357660.

The previous prime is 1357651. The next prime is 1357669. The reversal of 1357661 is 1667531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1020100 + 337561 = 1010^2 + 581^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1357661 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 (1357669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 678830 + 678831.

It is an arithmetic number, because the mean of its divisors is an integer number (678831).

2^1357661 is an apocalyptic number.

It is an amenable number.

1357661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1357661 is an equidigital number, since it uses as much as digits as its factorization.

1357661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3780, while the sum is 29.

The square root of 1357661 is about 1165.1871094378. The cubic root of 1357661 is about 110.7296127039.

The spelling of 1357661 in words is "one million, three hundred fifty-seven thousand, six hundred sixty-one".