1542780457 has 2 divisors, whose sum is σ = 1542780458. Its totient is φ = 1542780456.

The previous prime is 1542780451. The next prime is 1542780461. The reversal of 1542780457 is 7540872451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1242139536 + 300640921 = 35244^2 + 17339^2 .

It is a cyclic number.

It is not a de Polignac number, because 1542780457 - 2⁷ = 1542780329 is a prime.

It is a super-2 number, since 2×1542780457² = 4760343077002257698, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1542780451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 771390228 + 771390229.

It is an arithmetic number, because the mean of its divisors is an integer number (771390229).

Almost surely, 2^1542780457 is an apocalyptic number.

It is an amenable number.

1542780457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1542780457 is an equidigital number, since it uses as much as digits as its factorization.

1542780457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 313600, while the sum is 43.

The square root of 1542780457 is about 39278.2440671678. The cubic root of 1542780457 is about 1155.4949265366.

The spelling of 1542780457 in words is "one billion, five hundred forty-two million, seven hundred eighty thousand, four hundred fifty-seven".