212151561 has 16 divisors (see below), whose sum is σ = 289640448. Its totient is φ = 138064400.

The previous prime is 212151557. The next prime is 212151571. The reversal of 212151561 is 165151212.

It is a cyclic number.

It is not a de Polignac number, because 212151561 - 2² = 212151557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212151571) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59026 + ... + 62516.

It is an arithmetic number, because the mean of its divisors is an integer number (18102528).

Almost surely, 2^212151561 is an apocalyptic number.

It is an amenable number.

212151561 is a deficient number, since it is larger than the sum of its proper divisors (77488887).

212151561 is a wasteful number, since it uses less digits than its factorization.

212151561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3972.

The product of its digits is 600, while the sum is 24.

The square root of 212151561 is about 14565.4234747912. The cubic root of 212151561 is about 596.4152558915.

The spelling of 212151561 in words is "two hundred twelve million, one hundred fifty-one thousand, five hundred sixty-one".