64642049 has 2 divisors, whose sum is σ = 64642050. Its totient is φ = 64642048.

The previous prime is 64642031. The next prime is 64642057. The reversal of 64642049 is 94024646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54656449 + 9985600 = 7393^2 + 3160^2 .

It is a cyclic number.

It is not a de Polignac number, because 64642049 - 2⁸ = 64641793 is a prime.

It is a super-3 number, since 3×64642049³ (a number of 24 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64642549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32321024 + 32321025.

It is an arithmetic number, because the mean of its divisors is an integer number (32321025).

Almost surely, 2^64642049 is an apocalyptic number.

It is an amenable number.

64642049 is a deficient number, since it is larger than the sum of its proper divisors (1).

64642049 is an equidigital number, since it uses as much as digits as its factorization.

64642049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 64642049 is about 8040.0279228371. The cubic root of 64642049 is about 401.3331538988. Note that the first 3 decimals are identical.

The spelling of 64642049 in words is "sixty-four million, six hundred forty-two thousand, forty-nine".