215267197 has 2 divisors, whose sum is σ = 215267198. Its totient is φ = 215267196.

The previous prime is 215267111. The next prime is 215267233. The reversal of 215267197 is 791762512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115047076 + 100220121 = 10726^2 + 10011^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215267197 is a prime.

It is a super-2 number, since 2×215267197² = 92679932208473618, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215267497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107633598 + 107633599.

It is an arithmetic number, because the mean of its divisors is an integer number (107633599).

Almost surely, 2^215267197 is an apocalyptic number.

It is an amenable number.

215267197 is a deficient number, since it is larger than the sum of its proper divisors (1).

215267197 is an equidigital number, since it uses as much as digits as its factorization.

215267197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 40.

The square root of 215267197 is about 14671.9868116080. The cubic root of 215267197 is about 599.3207099356.

The spelling of 215267197 in words is "two hundred fifteen million, two hundred sixty-seven thousand, one hundred ninety-seven".