1540210641 has 4 divisors (see below), whose sum is σ = 2053614192. Its totient is φ = 1026807092.

The previous prime is 1540210613. The next prime is 1540210667. The reversal of 1540210641 is 1460120451.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1460120451 = 3 ⋅486706817.

It is a cyclic number.

It is not a de Polignac number, because 1540210641 - 2⁶ = 1540210577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1540210241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256701771 + ... + 256701776.

It is an arithmetic number, because the mean of its divisors is an integer number (513403548).

Almost surely, 2^1540210641 is an apocalyptic number.

It is an amenable number.

1540210641 is a deficient number, since it is larger than the sum of its proper divisors (513403551).

1540210641 is an equidigital number, since it uses as much as digits as its factorization.

1540210641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513403550.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 1540210641 is about 39245.5174637818. The cubic root of 1540210641 is about 1154.8529990385.

The spelling of 1540210641 in words is "one billion, five hundred forty million, two hundred ten thousand, six hundred forty-one".