109487821 has 2 divisors, whose sum is σ = 109487822. Its totient is φ = 109487820.

The previous prime is 109487783. The next prime is 109487831. The reversal of 109487821 is 128784901.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58522500 + 50965321 = 7650^2 + 7139^2 .

It is a cyclic number.

It is not a de Polignac number, because 109487821 - 2⁹ = 109487309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109487831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54743910 + 54743911.

It is an arithmetic number, because the mean of its divisors is an integer number (54743911).

Almost surely, 2^109487821 is an apocalyptic number.

It is an amenable number.

109487821 is a deficient number, since it is larger than the sum of its proper divisors (1).

109487821 is an equidigital number, since it uses as much as digits as its factorization.

109487821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 40.

The square root of 109487821 is about 10463.6428169161. The cubic root of 109487821 is about 478.3971725657.

It can be divided in two parts, 10948 and 7821, that added together give a square (18769 = 137²).

The spelling of 109487821 in words is "one hundred nine million, four hundred eighty-seven thousand, eight hundred twenty-one".