109739621 has 2 divisors, whose sum is σ = 109739622. Its totient is φ = 109739620.

The previous prime is 109739551. The next prime is 109739633. The reversal of 109739621 is 126937901.

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., 108451396 + 1288225 = 10414^2 + 1135^2 .

It is a cyclic number.

It is not a de Polignac number, because 109739621 - 2²² = 105545317 is a prime.

It is equal to p_6289157 and since 109739621 and 6289157 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109739681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54869810 + 54869811.

It is an arithmetic number, because the mean of its divisors is an integer number (54869811).

Almost surely, 2^109739621 is an apocalyptic number.

It is an amenable number.

109739621 is a deficient number, since it is larger than the sum of its proper divisors (1).

109739621 is an equidigital number, since it uses as much as digits as its factorization.

109739621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 109739621 is about 10475.6680455234. The cubic root of 109739621 is about 478.7636309226.

The spelling of 109739621 in words is "one hundred nine million, seven hundred thirty-nine thousand, six hundred twenty-one".