39961261 has 2 divisors, whose sum is σ = 39961262. Its totient is φ = 39961260.

The previous prime is 39961223. The next prime is 39961277. The reversal of 39961261 is 16216993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39816100 + 145161 = 6310^2 + 381^2 .

It is a cyclic number.

It is not a de Polignac number, because 39961261 - 2⁷ = 39961133 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39961261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39961661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19980630 + 19980631.

It is an arithmetic number, because the mean of its divisors is an integer number (19980631).

Almost surely, 2^39961261 is an apocalyptic number.

It is an amenable number.

39961261 is a deficient number, since it is larger than the sum of its proper divisors (1).

39961261 is an equidigital number, since it uses as much as digits as its factorization.

39961261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17496, while the sum is 37.

The square root of 39961261 is about 6321.4919916108. The cubic root of 39961261 is about 341.8847490778.

The spelling of 39961261 in words is "thirty-nine million, nine hundred sixty-one thousand, two hundred sixty-one".