210520157 has 2 divisors, whose sum is σ = 210520158. Its totient is φ = 210520156.

The previous prime is 210520109. The next prime is 210520159. The reversal of 210520157 is 751025012.

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., 108388921 + 102131236 = 10411^2 + 10106^2 .

It is a cyclic number.

It is not a de Polignac number, because 210520157 - 2⁸ = 210519901 is a prime.

Together with 210520159, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210520159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105260078 + 105260079.

It is an arithmetic number, because the mean of its divisors is an integer number (105260079).

Almost surely, 2^210520157 is an apocalyptic number.

It is an amenable number.

210520157 is a deficient number, since it is larger than the sum of its proper divisors (1).

210520157 is an equidigital number, since it uses as much as digits as its factorization.

210520157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 700, while the sum is 23.

The square root of 210520157 is about 14509.3127680121. The cubic root of 210520157 is about 594.8825481983.

Adding to 210520157 its reverse (751025012), we get a palindrome (961545169).

The spelling of 210520157 in words is "two hundred ten million, five hundred twenty thousand, one hundred fifty-seven".