1542535021 has 2 divisors, whose sum is σ = 1542535022. Its totient is φ = 1542535020.

The previous prime is 1542535009. The next prime is 1542535061. The reversal of 1542535021 is 1205352451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1488879396 + 53655625 = 38586^2 + 7325^2 .

It is a cyclic number.

It is not a de Polignac number, because 1542535021 - 2¹³ = 1542526829 is a prime.

It is a super-2 number, since 2×1542535021² = 4758828582022940882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1542535061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 771267510 + 771267511.

It is an arithmetic number, because the mean of its divisors is an integer number (771267511).

Almost surely, 2^1542535021 is an apocalyptic number.

It is an amenable number.

1542535021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1542535021 is an equidigital number, since it uses as much as digits as its factorization.

1542535021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 1542535021 is about 39275.1196178955. The cubic root of 1542535021 is about 1155.4336486251.

Adding to 1542535021 its reverse (1205352451), we get a palindrome (2747887472).

The spelling of 1542535021 in words is "one billion, five hundred forty-two million, five hundred thirty-five thousand, twenty-one".