545023991 has 2 divisors, whose sum is σ = 545023992. Its totient is φ = 545023990.

The previous prime is 545023979. The next prime is 545024021. The reversal of 545023991 is 199320545.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-545023991 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (545023901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272511995 + 272511996.

It is an arithmetic number, because the mean of its divisors is an integer number (272511996).

Almost surely, 2^545023991 is an apocalyptic number.

545023991 is a deficient number, since it is larger than the sum of its proper divisors (1).

545023991 is an equidigital number, since it uses as much as digits as its factorization.

545023991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48600, while the sum is 38.

The square root of 545023991 is about 23345.7488849683. The cubic root of 545023991 is about 816.8429025368.

The spelling of 545023991 in words is "five hundred forty-five million, twenty-three thousand, nine hundred ninety-one".