109640857 has 2 divisors, whose sum is σ = 109640858. Its totient is φ = 109640856.

The previous prime is 109640833. The next prime is 109640863. The reversal of 109640857 is 758046901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90839961 + 18800896 = 9531^2 + 4336^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-109640857 is a prime.

It is a super-2 number, since 2×109640857² = 24042235047388898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (109640897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54820428 + 54820429.

It is an arithmetic number, because the mean of its divisors is an integer number (54820429).

Almost surely, 2^109640857 is an apocalyptic number.

It is an amenable number.

109640857 is a deficient number, since it is larger than the sum of its proper divisors (1).

109640857 is an equidigital number, since it uses as much as digits as its factorization.

109640857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 109640857 is about 10470.9530129783. The cubic root of 109640857 is about 478.6199611369.

The spelling of 109640857 in words is "one hundred nine million, six hundred forty thousand, eight hundred fifty-seven".