1542782161 has 2 divisors, whose sum is σ = 1542782162. Its totient is φ = 1542782160.

The previous prime is 1542782099. The next prime is 1542782173. The reversal of 1542782161 is 1612872451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1457330625 + 85451536 = 38175^2 + 9244^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1542782161 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1542782161.

It is not a weakly prime, because it can be changed into another prime (1542782561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 771391080 + 771391081.

It is an arithmetic number, because the mean of its divisors is an integer number (771391081).

Almost surely, 2^1542782161 is an apocalyptic number.

It is an amenable number.

1542782161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1542782161 is an equidigital number, since it uses as much as digits as its factorization.

1542782161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26880, while the sum is 37.

The square root of 1542782161 is about 39278.2657585591. The cubic root of 1542782161 is about 1155.4953519509.

The spelling of 1542782161 in words is "one billion, five hundred forty-two million, seven hundred eighty-two thousand, one hundred sixty-one".