1540323121 has 2 divisors, whose sum is σ = 1540323122. Its totient is φ = 1540323120.

The previous prime is 1540323077. The next prime is 1540323143. The reversal of 1540323121 is 1213230451.

It is a happy number.

It is an a-pointer prime, because the next prime (1540323143) can be obtained adding 1540323121 to its sum of digits (22).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1467732721 + 72590400 = 38311^2 + 8520^2 .

It is a cyclic number.

It is not a de Polignac number, because 1540323121 - 2¹³ = 1540314929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1540323092 and 1540323101.

It is not a weakly prime, because it can be changed into another prime (1540323221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 770161560 + 770161561.

It is an arithmetic number, because the mean of its divisors is an integer number (770161561).

Almost surely, 2^1540323121 is an apocalyptic number.

It is an amenable number.

1540323121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1540323121 is an equidigital number, since it uses as much as digits as its factorization.

1540323121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1540323121 is about 39246.9504675204. The cubic root of 1540323121 is about 1154.8811109300.

Adding to 1540323121 its reverse (1213230451), we get a palindrome (2753553572).

The spelling of 1540323121 in words is "one billion, five hundred forty million, three hundred twenty-three thousand, one hundred twenty-one".