65421247 has 2 divisors, whose sum is σ = 65421248. Its totient is φ = 65421246.

The previous prime is 65421229. The next prime is 65421259. The reversal of 65421247 is 74212456.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65421247 - 2⁷ = 65421119 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65401247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32710623 + 32710624.

It is an arithmetic number, because the mean of its divisors is an integer number (32710624).

Almost surely, 2^65421247 is an apocalyptic number.

65421247 is a deficient number, since it is larger than the sum of its proper divisors (1).

65421247 is an equidigital number, since it uses as much as digits as its factorization.

65421247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 31.

The square root of 65421247 is about 8088.3401881968. The cubic root of 65421247 is about 402.9392799306.

The spelling of 65421247 in words is "sixty-five million, four hundred twenty-one thousand, two hundred forty-seven".