1542490921 has 8 divisors (see below), whose sum is σ = 1558769184. Its totient is φ = 1526247360.

The previous prime is 1542490919. The next prime is 1542490973. The reversal of 1542490921 is 1290942451.

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 1542490921 - 2¹ = 1542490919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1542490981) 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, 86086 + ... + 102448.

It is an arithmetic number, because the mean of its divisors is an integer number (194846148).

Almost surely, 2^1542490921 is an apocalyptic number.

It is an amenable number.

1542490921 is a deficient number, since it is larger than the sum of its proper divisors (16278263).

1542490921 is a wasteful number, since it uses less digits than its factorization.

1542490921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17351.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 1542490921 is about 39274.5581897493. The cubic root of 1542490921 is about 1155.4226375062.

The spelling of 1542490921 in words is "one billion, five hundred forty-two million, four hundred ninety thousand, nine hundred twenty-one".