64349861 has 2 divisors, whose sum is σ = 64349862. Its totient is φ = 64349860.

The previous prime is 64349851. The next prime is 64349863. The reversal of 64349861 is 16894346.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50324836 + 14025025 = 7094^2 + 3745^2 .

It is a cyclic number.

It is not a de Polignac number, because 64349861 - 2⁶ = 64349797 is a prime.

It is a super-2 number, since 2×64349861² = 8281809221438642, which contains 22 as substring.

Together with 64349863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64349863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32174930 + 32174931.

It is an arithmetic number, because the mean of its divisors is an integer number (32174931).

Almost surely, 2^64349861 is an apocalyptic number.

It is an amenable number.

64349861 is a deficient number, since it is larger than the sum of its proper divisors (1).

64349861 is an equidigital number, since it uses as much as digits as its factorization.

64349861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 41.

The square root of 64349861 is about 8021.8365104258. The cubic root of 64349861 is about 400.7275529478.

The spelling of 64349861 in words is "sixty-four million, three hundred forty-nine thousand, eight hundred sixty-one".