1540521763 has 4 divisors (see below), whose sum is σ = 1680569208. Its totient is φ = 1400474320.

The previous prime is 1540521757. The next prime is 1540521799. The reversal of 1540521763 is 3671250451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3671250451 = 11 ⋅333750041.

It is a cyclic number.

It is not a de Polignac number, because 1540521763 - 2²¹ = 1538424611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1540521733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70023706 + ... + 70023727.

It is an arithmetic number, because the mean of its divisors is an integer number (420142302).

Almost surely, 2^1540521763 is an apocalyptic number.

1540521763 is a deficient number, since it is larger than the sum of its proper divisors (140047445).

1540521763 is a wasteful number, since it uses less digits than its factorization.

1540521763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140047444.

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

The square root of 1540521763 is about 39249.4810538942. The cubic root of 1540521763 is about 1154.9307537679.

The spelling of 1540521763 in words is "one billion, five hundred forty million, five hundred twenty-one thousand, seven hundred sixty-three".