1542636641 has 8 divisors (see below), whose sum is σ = 1898629824. Its totient is φ = 1220547600.

The previous prime is 1542636637. The next prime is 1542636647. The reversal of 1542636641 is 1466362451.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1542636641 - 2² = 1542636637 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1542636595 and 1542636604.

It is not an unprimeable number, because it can be changed into a prime (1542636647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8475935 + ... + 8476116.

It is an arithmetic number, because the mean of its divisors is an integer number (237328728).

Almost surely, 2^1542636641 is an apocalyptic number.

It is an amenable number.

1542636641 is a deficient number, since it is larger than the sum of its proper divisors (355993183).

1542636641 is a wasteful number, since it uses less digits than its factorization.

1542636641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16952071.

The product of its digits is 103680, while the sum is 38.

The square root of 1542636641 is about 39276.4132909307. The cubic root of 1542636641 is about 1155.4590208398.

The spelling of 1542636641 in words is "one billion, five hundred forty-two million, six hundred thirty-six thousand, six hundred forty-one".