39513961 has 2 divisors, whose sum is σ = 39513962. Its totient is φ = 39513960.

The previous prime is 39513959. The next prime is 39513997. The reversal of 39513961 is 16931593.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34292736 + 5221225 = 5856^2 + 2285^2 .

It is a cyclic number.

It is not a de Polignac number, because 39513961 - 2¹ = 39513959 is a prime.

It is a super-2 number, since 2×39513961² = 3122706227819042, which contains 22 as substring.

Together with 39513959, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39513961.

It is not a weakly prime, because it can be changed into another prime (39513911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19756980 + 19756981.

It is an arithmetic number, because the mean of its divisors is an integer number (19756981).

Almost surely, 2^39513961 is an apocalyptic number.

It is an amenable number.

39513961 is a deficient number, since it is larger than the sum of its proper divisors (1).

39513961 is an equidigital number, since it uses as much as digits as its factorization.

39513961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21870, while the sum is 37.

The square root of 39513961 is about 6286.0131243897. The cubic root of 39513961 is about 340.6043490103.

The spelling of 39513961 in words is "thirty-nine million, five hundred thirteen thousand, nine hundred sixty-one".