212487157 has 2 divisors, whose sum is σ = 212487158. Its totient is φ = 212487156.

The previous prime is 212487139. The next prime is 212487193. The reversal of 212487157 is 751784212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131469156 + 81018001 = 11466^2 + 9001^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212487157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212487257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106243578 + 106243579.

It is an arithmetic number, because the mean of its divisors is an integer number (106243579).

Almost surely, 2^212487157 is an apocalyptic number.

It is an amenable number.

212487157 is a deficient number, since it is larger than the sum of its proper divisors (1).

212487157 is an equidigital number, since it uses as much as digits as its factorization.

212487157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31360, while the sum is 37.

The square root of 212487157 is about 14576.9392191914. The cubic root of 212487157 is about 596.7295738355.

The spelling of 212487157 in words is "two hundred twelve million, four hundred eighty-seven thousand, one hundred fifty-seven".