1540418261 has 4 divisors (see below), whose sum is σ = 1607392992. Its totient is φ = 1473443532.

The previous prime is 1540418233. The next prime is 1540418267. The reversal of 1540418261 is 1628140451.

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.

It is a cyclic number.

It is not a de Polignac number, because 1540418261 - 2¹⁰ = 1540417237 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 (1540418267) 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, 33487331 + ... + 33487376.

It is an arithmetic number, because the mean of its divisors is an integer number (401848248).

Almost surely, 2^1540418261 is an apocalyptic number.

It is an amenable number.

1540418261 is a deficient number, since it is larger than the sum of its proper divisors (66974731).

1540418261 is an equidigital number, since it uses as much as digits as its factorization.

1540418261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66974730.

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 1540418261 is about 39248.1625174988. The cubic root of 1540418261 is about 1154.9048880032.

The spelling of 1540418261 in words is "one billion, five hundred forty million, four hundred eighteen thousand, two hundred sixty-one".