1523140121 has 2 divisors, whose sum is σ = 1523140122. Its totient is φ = 1523140120.

The previous prime is 1523140097. The next prime is 1523140123. The reversal of 1523140121 is 1210413251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1393976896 + 129163225 = 37336^2 + 11365^2 .

It is a cyclic number.

It is not a de Polignac number, because 1523140121 - 2²² = 1518945817 is a prime.

Together with 1523140123, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1523140093 and 1523140102.

It is not a weakly prime, because it can be changed into another prime (1523140123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 761570060 + 761570061.

It is an arithmetic number, because the mean of its divisors is an integer number (761570061).

Almost surely, 2^1523140121 is an apocalyptic number.

It is an amenable number.

1523140121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1523140121 is an equidigital number, since it uses as much as digits as its factorization.

1523140121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1523140121 is about 39027.4278040457. The cubic root of 1523140121 is about 1150.5706357674.

Adding to 1523140121 its reverse (1210413251), we get a palindrome (2733553372).

The spelling of 1523140121 in words is "one billion, five hundred twenty-three million, one hundred forty thousand, one hundred twenty-one".