1540755221 has 8 divisors (see below), whose sum is σ = 1596918840. Its totient is φ = 1485355968.

The previous prime is 1540755199. The next prime is 1540755241. The reversal of 1540755221 is 1225570451.

It can be written as a sum of positive squares in 4 ways, for example, as 1089660100 + 451095121 = 33010^2 + 21239^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1540755221 - 2³⁰ = 467013397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1540755241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186986 + ... + 195051.

It is an arithmetic number, because the mean of its divisors is an integer number (199614855).

Almost surely, 2^1540755221 is an apocalyptic number.

It is an amenable number.

1540755221 is a deficient number, since it is larger than the sum of its proper divisors (56163619).

1540755221 is a wasteful number, since it uses less digits than its factorization.

1540755221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382183.

The product of its (nonzero) digits is 14000, while the sum is 32.

The square root of 1540755221 is about 39252.4549678106. The cubic root of 1540755221 is about 1154.9890920554.

The spelling of 1540755221 in words is "one billion, five hundred forty million, seven hundred fifty-five thousand, two hundred twenty-one".