215432489 has 2 divisors, whose sum is σ = 215432490. Its totient is φ = 215432488.

The previous prime is 215432473. The next prime is 215432501. The reversal of 215432489 is 984234512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 186186025 + 29246464 = 13645^2 + 5408^2 .

It is a cyclic number.

It is not a de Polignac number, because 215432489 - 2⁴ = 215432473 is a prime.

It is a super-2 number, since 2×215432489² = 92822314633470242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (215432429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107716244 + 107716245.

It is an arithmetic number, because the mean of its divisors is an integer number (107716245).

Almost surely, 2^215432489 is an apocalyptic number.

It is an amenable number.

215432489 is a deficient number, since it is larger than the sum of its proper divisors (1).

215432489 is an equidigital number, since it uses as much as digits as its factorization.

215432489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 38.

The square root of 215432489 is about 14677.6186420005. The cubic root of 215432489 is about 599.4740659756.

It can be divided in two parts, 2154 and 32489, that added together give a palindrome (34643).

The spelling of 215432489 in words is "two hundred fifteen million, four hundred thirty-two thousand, four hundred eighty-nine".