1542565081 has 4 divisors (see below), whose sum is σ = 1609633152. Its totient is φ = 1475497012.

The previous prime is 1542565069. The next prime is 1542565097. The reversal of 1542565081 is 1805652451.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1805652451 = 1951 ⋅925501.

It is not a de Polignac number, because 1542565081 - 2⁵ = 1542565049 is a prime.

It is a super-3 number, since 3×1542565081³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1542565081.

It is not an unprimeable number, because it can be changed into a prime (1542565061) 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 in 3 ways as a sum of consecutive naturals, for example, 33534001 + ... + 33534046.

It is an arithmetic number, because the mean of its divisors is an integer number (402408288).

Almost surely, 2^1542565081 is an apocalyptic number.

It is an amenable number.

1542565081 is a deficient number, since it is larger than the sum of its proper divisors (67068071).

1542565081 is an equidigital number, since it uses as much as digits as its factorization.

1542565081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67068070.

The product of its (nonzero) digits is 48000, while the sum is 37.

The square root of 1542565081 is about 39275.5023010528. The cubic root of 1542565081 is about 1155.4411540430.

The spelling of 1542565081 in words is "one billion, five hundred forty-two million, five hundred sixty-five thousand, eighty-one".