540861557 has 4 divisors (see below), whose sum is σ = 558308736. Its totient is φ = 523414380.

The previous prime is 540861551. The next prime is 540861617. The reversal of 540861557 is 755168045.

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: 755168045 = 5 ⋅151033609.

It is a cyclic number.

It is not a de Polignac number, because 540861557 - 2¹² = 540857461 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 (540861551) 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, 8723543 + ... + 8723604.

It is an arithmetic number, because the mean of its divisors is an integer number (139577184).

Almost surely, 2^540861557 is an apocalyptic number.

It is an amenable number.

540861557 is a deficient number, since it is larger than the sum of its proper divisors (17447179).

540861557 is a wasteful number, since it uses less digits than its factorization.

540861557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17447178.

The product of its (nonzero) digits is 168000, while the sum is 41.

The square root of 540861557 is about 23256.4304440729. The cubic root of 540861557 is about 814.7581336562.

The spelling of 540861557 in words is "five hundred forty million, eight hundred sixty-one thousand, five hundred fifty-seven".