2101157 has 2 divisors, whose sum is σ = 2101158. Its totient is φ = 2101156.

The previous prime is 2101139. The next prime is 2101181. The reversal of 2101157 is 7511012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1999396 + 101761 = 1414^2 + 319^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101157 - 2⁶ = 2101093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050578 + 1050579.

It is an arithmetic number, because the mean of its divisors is an integer number (1050579).

2^2101157 is an apocalyptic number.

It is an amenable number.

2101157 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101157 is an equidigital number, since it uses as much as digits as its factorization.

2101157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70, while the sum is 17.

The square root of 2101157 is about 1449.5368225747. The cubic root of 2101157 is about 128.0814301190.

Adding to 2101157 its reverse (7511012), we get a palindrome (9612169).

The spelling of 2101157 in words is "two million, one hundred one thousand, one hundred fifty-seven".