1542661 has 2 divisors, whose sum is σ = 1542662. Its totient is φ = 1542660.

The previous prime is 1542599. The next prime is 1542689. The reversal of 1542661 is 1662451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 893025 + 649636 = 945^2 + 806^2 .

It is a cyclic number.

It is not a de Polignac number, because 1542661 - 2⁷ = 1542533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1542691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 771330 + 771331.

It is an arithmetic number, because the mean of its divisors is an integer number (771331).

2^1542661 is an apocalyptic number.

It is an amenable number.

1542661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1542661 is an equidigital number, since it uses as much as digits as its factorization.

1542661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 25.

The square root of 1542661 is about 1242.0390493056. The cubic root of 1542661 is about 115.5465102565.

The spelling of 1542661 in words is "one million, five hundred forty-two thousand, six hundred sixty-one".