1540261537 has 2 divisors, whose sum is σ = 1540261538. Its totient is φ = 1540261536.

The previous prime is 1540261519. The next prime is 1540261549. The reversal of 1540261537 is 7351620451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1242492001 + 297769536 = 35249^2 + 17256^2 .

It is a cyclic number.

It is not a de Polignac number, because 1540261537 - 2⁷ = 1540261409 is a prime.

It is not a weakly prime, because it can be changed into another prime (1540261577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 770130768 + 770130769.

It is an arithmetic number, because the mean of its divisors is an integer number (770130769).

Almost surely, 2^1540261537 is an apocalyptic number.

It is an amenable number.

1540261537 is a deficient number, since it is larger than the sum of its proper divisors (1).

1540261537 is an equidigital number, since it uses as much as digits as its factorization.

1540261537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 1540261537 is about 39246.1658891668. The cubic root of 1540261537 is about 1154.8657195390.

Adding to 1540261537 its reverse (7351620451), we get a palindrome (8891881988).

The spelling of 1540261537 in words is "one billion, five hundred forty million, two hundred sixty-one thousand, five hundred thirty-seven".