1539137921 has 8 divisors (see below), whose sum is σ = 1620946080. Its totient is φ = 1457409888.

The previous prime is 1539137893. The next prime is 1539137927. The reversal of 1539137921 is 1297319351.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1539137921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1539137927) 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, 21650 + ... + 59556.

It is an arithmetic number, because the mean of its divisors is an integer number (202618260).

Almost surely, 2^1539137921 is an apocalyptic number.

It is an amenable number.

1539137921 is a deficient number, since it is larger than the sum of its proper divisors (81808159).

1539137921 is a wasteful number, since it uses less digits than its factorization.

1539137921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40063.

The product of its digits is 51030, while the sum is 41.

The square root of 1539137921 is about 39231.8482995640. The cubic root of 1539137921 is about 1154.5848275747.

The spelling of 1539137921 in words is "one billion, five hundred thirty-nine million, one hundred thirty-seven thousand, nine hundred twenty-one".