64139741 has 2 divisors, whose sum is σ = 64139742. Its totient is φ = 64139740.

The previous prime is 64139723. The next prime is 64139749. The reversal of 64139741 is 14793146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59059225 + 5080516 = 7685^2 + 2254^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64139741 is a prime.

It is a super-2 number, since 2×64139741² = 8227812751094162, which contains 22 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 (64139749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32069870 + 32069871.

It is an arithmetic number, because the mean of its divisors is an integer number (32069871).

Almost surely, 2^64139741 is an apocalyptic number.

It is an amenable number.

64139741 is a deficient number, since it is larger than the sum of its proper divisors (1).

64139741 is an equidigital number, since it uses as much as digits as its factorization.

64139741 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 35.

The square root of 64139741 is about 8008.7290502301. The cubic root of 64139741 is about 400.2909154525.

The spelling of 64139741 in words is "sixty-four million, one hundred thirty-nine thousand, seven hundred forty-one".