2661457 has 2 divisors, whose sum is σ = 2661458. Its totient is φ = 2661456.

The previous prime is 2661427. The next prime is 2661473. The reversal of 2661457 is 7541662.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2660161 + 1296 = 1631^2 + 36^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2661457 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2661427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330728 + 1330729.

It is an arithmetic number, because the mean of its divisors is an integer number (1330729).

2^2661457 is an apocalyptic number.

It is an amenable number.

2661457 is a deficient number, since it is larger than the sum of its proper divisors (1).

2661457 is an equidigital number, since it uses as much as digits as its factorization.

2661457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 31.

The square root of 2661457 is about 1631.3972538901. The cubic root of 2661457 is about 138.5818914712.

The spelling of 2661457 in words is "two million, six hundred sixty-one thousand, four hundred fifty-seven".