55089787 has 2 divisors, whose sum is σ = 55089788. Its totient is φ = 55089786.

The previous prime is 55089757. The next prime is 55089803. The reversal of 55089787 is 78798055.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55089787 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55089787.

It is not a weakly prime, because it can be changed into another prime (55089757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27544893 + 27544894.

It is an arithmetic number, because the mean of its divisors is an integer number (27544894).

Almost surely, 2^55089787 is an apocalyptic number.

55089787 is a deficient number, since it is larger than the sum of its proper divisors (1).

55089787 is an equidigital number, since it uses as much as digits as its factorization.

55089787 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 705600, while the sum is 49.

The square root of 55089787 is about 7422.2494568695. The cubic root of 55089787 is about 380.5020764114.

The spelling of 55089787 in words is "fifty-five million, eighty-nine thousand, seven hundred eighty-seven".