109951921 has 2 divisors, whose sum is σ = 109951922. Its totient is φ = 109951920.

The previous prime is 109951913. The next prime is 109951931. The reversal of 109951921 is 129159901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101909025 + 8042896 = 10095^2 + 2836^2 .

It is a cyclic number.

It is not a de Polignac number, because 109951921 - 2³ = 109951913 is a prime.

It is not a weakly prime, because it can be changed into another prime (109951931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54975960 + 54975961.

It is an arithmetic number, because the mean of its divisors is an integer number (54975961).

Almost surely, 2^109951921 is an apocalyptic number.

It is an amenable number.

109951921 is a deficient number, since it is larger than the sum of its proper divisors (1).

109951921 is an equidigital number, since it uses as much as digits as its factorization.

109951921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7290, while the sum is 37.

The square root of 109951921 is about 10485.7961547991. The cubic root of 109951921 is about 479.0721674498.

The spelling of 109951921 in words is "one hundred nine million, nine hundred fifty-one thousand, nine hundred twenty-one".