1540421613 has 6 divisors (see below), whose sum is σ = 2225053454. Its totient is φ = 1026947736.

The previous prime is 1540421579. The next prime is 1540421621. The reversal of 1540421613 is 3161240451.

It is a happy number.

1540421613 is a `hidden beast` number, since 1 + 5 + 4 + 0 + 42 + 1 + 613 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1537659369 + 2762244 = 39213^2 + 1662^2 .

It is not a de Polignac number, because 1540421613 - 2⁶ = 1540421549 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 (1540421683) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 85578970 + ... + 85578987.

Almost surely, 2^1540421613 is an apocalyptic number.

It is an amenable number.

1540421613 is a deficient number, since it is larger than the sum of its proper divisors (684631841).

1540421613 is a wasteful number, since it uses less digits than its factorization.

1540421613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171157963 (or 171157960 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 1540421613 is about 39248.2052201117. The cubic root of 1540421613 is about 1154.9057257061.

The spelling of 1540421613 in words is "one billion, five hundred forty million, four hundred twenty-one thousand, six hundred thirteen".