109621957 has 2 divisors, whose sum is σ = 109621958. Its totient is φ = 109621956.

The previous prime is 109621951. The next prime is 109621997. The reversal of 109621957 is 759126901.

It is an a-pointer prime, because the next prime (109621997) can be obtained adding 109621957 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98426241 + 11195716 = 9921^2 + 3346^2 .

It is a cyclic number.

It is not a de Polignac number, because 109621957 - 2⁷ = 109621829 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109621951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54810978 + 54810979.

It is an arithmetic number, because the mean of its divisors is an integer number (54810979).

Almost surely, 2^109621957 is an apocalyptic number.

It is an amenable number.

109621957 is a deficient number, since it is larger than the sum of its proper divisors (1).

109621957 is an equidigital number, since it uses as much as digits as its factorization.

109621957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34020, while the sum is 40.

The square root of 109621957 is about 10470.0504774332. The cubic root of 109621957 is about 478.5924578948.

The spelling of 109621957 in words is "one hundred nine million, six hundred twenty-one thousand, nine hundred fifty-seven".