1542463891 has 2 divisors, whose sum is σ = 1542463892. Its totient is φ = 1542463890.

The previous prime is 1542463889. The next prime is 1542463903. The reversal of 1542463891 is 1983642451.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1542463891 - 2¹ = 1542463889 is a prime.

Together with 1542463889, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1542463801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 771231945 + 771231946.

It is an arithmetic number, because the mean of its divisors is an integer number (771231946).

Almost surely, 2^1542463891 is an apocalyptic number.

1542463891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1542463891 is an equidigital number, since it uses as much as digits as its factorization.

1542463891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 43.

The square root of 1542463891 is about 39274.2140723401. The cubic root of 1542463891 is about 1155.4158884106.

The spelling of 1542463891 in words is "one billion, five hundred forty-two million, four hundred sixty-three thousand, eight hundred ninety-one".