542220691 has 4 divisors (see below), whose sum is σ = 544150584. Its totient is φ = 540290800.

The previous prime is 542220683. The next prime is 542220703. The reversal of 542220691 is 196022245.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 196022245 = 5 ⋅39204449.

It is a cyclic number.

It is not a de Polignac number, because 542220691 - 2³ = 542220683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (542220611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 964525 + ... + 965086.

It is an arithmetic number, because the mean of its divisors is an integer number (136037646).

Almost surely, 2^542220691 is an apocalyptic number.

542220691 is a deficient number, since it is larger than the sum of its proper divisors (1929893).

542220691 is a wasteful number, since it uses less digits than its factorization.

542220691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1929892.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 542220691 is about 23285.6327163339. The cubic root of 542220691 is about 815.4400328664.

The spelling of 542220691 in words is "five hundred forty-two million, two hundred twenty thousand, six hundred ninety-one".