100155257 has 2 divisors, whose sum is σ = 100155258. Its totient is φ = 100155256.

The previous prime is 100155247. The next prime is 100155259. The reversal of 100155257 is 752551001.

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., 96510976 + 3644281 = 9824^2 + 1909^2 .

It is a cyclic number.

It is not a de Polignac number, because 100155257 - 2²⁶ = 33046393 is a prime.

Together with 100155259, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (100155259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50077628 + 50077629.

It is an arithmetic number, because the mean of its divisors is an integer number (50077629).

Almost surely, 2^100155257 is an apocalyptic number.

It is an amenable number.

100155257 is a deficient number, since it is larger than the sum of its proper divisors (1).

100155257 is an equidigital number, since it uses as much as digits as its factorization.

100155257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1750, while the sum is 26.

The square root of 100155257 is about 10007.7598392447. The cubic root of 100155257 is about 464.3989722050.

The spelling of 100155257 in words is "one hundred million, one hundred fifty-five thousand, two hundred fifty-seven".