109128931 has 2 divisors, whose sum is σ = 109128932. Its totient is φ = 109128930.

The previous prime is 109128889. The next prime is 109128991. The reversal of 109128931 is 139821901.

It is a weak prime.

It is an emirp because it is prime and its reverse (139821901) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 109128931 - 2²³ = 100740323 is a prime.

It is a super-2 number, since 2×109128931² = 23818247162405522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (109128991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54564465 + 54564466.

It is an arithmetic number, because the mean of its divisors is an integer number (54564466).

Almost surely, 2^109128931 is an apocalyptic number.

109128931 is a deficient number, since it is larger than the sum of its proper divisors (1).

109128931 is an equidigital number, since it uses as much as digits as its factorization.

109128931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 109128931 is about 10446.4793590951. The cubic root of 109128931 is about 477.8738878802.

The spelling of 109128931 in words is "one hundred nine million, one hundred twenty-eight thousand, nine hundred thirty-one".