1542640901 has 2 divisors, whose sum is σ = 1542640902. Its totient is φ = 1542640900.

The previous prime is 1542640849. The next prime is 1542640907. The reversal of 1542640901 is 1090462451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1518972676 + 23668225 = 38974^2 + 4865^2 .

It is a cyclic number.

It is not a de Polignac number, because 1542640901 - 2¹⁸ = 1542378757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1542640907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 771320450 + 771320451.

It is an arithmetic number, because the mean of its divisors is an integer number (771320451).

Almost surely, 2^1542640901 is an apocalyptic number.

It is an amenable number.

1542640901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1542640901 is an equidigital number, since it uses as much as digits as its factorization.

1542640901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 1542640901 is about 39276.4675219144. The cubic root of 1542640901 is about 1155.4600844410.

The spelling of 1542640901 in words is "one billion, five hundred forty-two million, six hundred forty thousand, nine hundred one".