1540251541 has 2 divisors, whose sum is σ = 1540251542. Its totient is φ = 1540251540.

The previous prime is 1540251539. The next prime is 1540251547. The reversal of 1540251541 is 1451520451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1540248516 + 3025 = 39246^2 + 55^2 .

It is a cyclic number.

It is not a de Polignac number, because 1540251541 - 2¹ = 1540251539 is a prime.

Together with 1540251539, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1540251547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 770125770 + 770125771.

It is an arithmetic number, because the mean of its divisors is an integer number (770125771).

Almost surely, 2^1540251541 is an apocalyptic number.

It is an amenable number.

1540251541 is a deficient number, since it is larger than the sum of its proper divisors (1).

1540251541 is an equidigital number, since it uses as much as digits as its factorization.

1540251541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4000, while the sum is 28.

The square root of 1540251541 is about 39246.0385389405. The cubic root of 1540251541 is about 1154.8632212484.

Adding to 1540251541 its reverse (1451520451), we get a palindrome (2991771992).

The spelling of 1540251541 in words is "one billion, five hundred forty million, two hundred fifty-one thousand, five hundred forty-one".