1540252121 has 8 divisors (see below), whose sum is σ = 1561027584. Its totient is φ = 1519585200.

The previous prime is 1540252117. The next prime is 1540252123. The reversal of 1540252121 is 1212520451.

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 1540252121 - 2² = 1540252117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1540252123) 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, 1640 + ... + 55526.

It is an arithmetic number, because the mean of its divisors is an integer number (195128448).

Almost surely, 2^1540252121 is an apocalyptic number.

It is an amenable number.

1540252121 is a deficient number, since it is larger than the sum of its proper divisors (20775463).

1540252121 is a wasteful number, since it uses less digits than its factorization.

1540252121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54271.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 1540252121 is about 39246.0459282206. The cubic root of 1540252121 is about 1154.8633662076.

Adding to 1540252121 its reverse (1212520451), we get a palindrome (2752772572).

The spelling of 1540252121 in words is "one billion, five hundred forty million, two hundred fifty-two thousand, one hundred twenty-one".