1540207481 has 2 divisors, whose sum is σ = 1540207482. Its totient is φ = 1540207480.

The previous prime is 1540207477. The next prime is 1540207499. The reversal of 1540207481 is 1847020451.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1407750400 + 132457081 = 37520^2 + 11509^2 .

It is a cyclic number.

It is not a de Polignac number, because 1540207481 - 2² = 1540207477 is a prime.

It is a super-2 number, since 2×1540207481² = 4744478169056730722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1540207181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 770103740 + 770103741.

It is an arithmetic number, because the mean of its divisors is an integer number (770103741).

Almost surely, 2^1540207481 is an apocalyptic number.

It is an amenable number.

1540207481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1540207481 is an equidigital number, since it uses as much as digits as its factorization.

1540207481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8960, while the sum is 32.

The square root of 1540207481 is about 39245.4772043862. The cubic root of 1540207481 is about 1154.8522092465.

The spelling of 1540207481 in words is "one billion, five hundred forty million, two hundred seven thousand, four hundred eighty-one".