42154542091 has 2 divisors, whose sum is σ = 42154542092. Its totient is φ = 42154542090.

The previous prime is 42154541999. The next prime is 42154542139. The reversal of 42154542091 is 19024545124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42154542091 - 2⁹ = 42154541579 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42154542091.

It is not a weakly prime, because it can be changed into another prime (42154512091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21077271045 + 21077271046.

It is an arithmetic number, because the mean of its divisors is an integer number (21077271046).

Almost surely, 2^42154542091 is an apocalyptic number.

42154542091 is a deficient number, since it is larger than the sum of its proper divisors (1).

42154542091 is an equidigital number, since it uses as much as digits as its factorization.

42154542091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 57600, while the sum is 37.

The spelling of 42154542091 in words is "forty-two billion, one hundred fifty-four million, five hundred forty-two thousand, ninety-one".