215451461 has 2 divisors, whose sum is σ = 215451462. Its totient is φ = 215451460.

The previous prime is 215451449. The next prime is 215451479. The reversal of 215451461 is 164154512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211120900 + 4330561 = 14530^2 + 2081^2 .

It is a cyclic number.

It is not a de Polignac number, because 215451461 - 2¹⁰ = 215450437 is a prime.

It is a super-3 number, since 3×215451461³ (a number of 26 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215451491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107725730 + 107725731.

It is an arithmetic number, because the mean of its divisors is an integer number (107725731).

Almost surely, 2^215451461 is an apocalyptic number.

It is an amenable number.

215451461 is a deficient number, since it is larger than the sum of its proper divisors (1).

215451461 is an equidigital number, since it uses as much as digits as its factorization.

215451461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4800, while the sum is 29.

The square root of 215451461 is about 14678.2649178982. The cubic root of 215451461 is about 599.4916629626.

The spelling of 215451461 in words is "two hundred fifteen million, four hundred fifty-one thousand, four hundred sixty-one".