1542985891 has 2 divisors, whose sum is σ = 1542985892. Its totient is φ = 1542985890.

The previous prime is 1542985859. The next prime is 1542985921. The reversal of 1542985891 is 1985892451.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1542985891 - 2⁵ = 1542985859 is a prime.

It is not a weakly prime, because it can be changed into another prime (1542985811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 771492945 + 771492946.

It is an arithmetic number, because the mean of its divisors is an integer number (771492946).

Almost surely, 2^1542985891 is an apocalyptic number.

1542985891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1542985891 is an equidigital number, since it uses as much as digits as its factorization.

1542985891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1036800, while the sum is 52.

The square root of 1542985891 is about 39280.8590919292. The cubic root of 1542985891 is about 1155.5462121680.

The spelling of 1542985891 in words is "one billion, five hundred forty-two million, nine hundred eighty-five thousand, eight hundred ninety-one".