212161507 has 2 divisors, whose sum is σ = 212161508. Its totient is φ = 212161506.

The previous prime is 212161471. The next prime is 212161553. The reversal of 212161507 is 705161212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212161507 - 2¹¹ = 212159459 is a prime.

It is a super-4 number, since 4×212161507⁴ (a number of 34 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (212161577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106080753 + 106080754.

It is an arithmetic number, because the mean of its divisors is an integer number (106080754).

Almost surely, 2^212161507 is an apocalyptic number.

212161507 is a deficient number, since it is larger than the sum of its proper divisors (1).

212161507 is an equidigital number, since it uses as much as digits as its factorization.

212161507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 212161507 is about 14565.7648958096. The cubic root of 212161507 is about 596.4245760420.

The spelling of 212161507 in words is "two hundred twelve million, one hundred sixty-one thousand, five hundred seven".