39220981 has 2 divisors, whose sum is σ = 39220982. Its totient is φ = 39220980.

The previous prime is 39220967. The next prime is 39221011. The reversal of 39220981 is 18902293.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21022225 + 18198756 = 4585^2 + 4266^2 .

It is a cyclic number.

It is not a de Polignac number, because 39220981 - 2⁵ = 39220949 is a prime.

It is a super-2 number, since 2×39220981² = 3076570701204722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39220931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19610490 + 19610491.

It is an arithmetic number, because the mean of its divisors is an integer number (19610491).

Almost surely, 2^39220981 is an apocalyptic number.

It is an amenable number.

39220981 is a deficient number, since it is larger than the sum of its proper divisors (1).

39220981 is an equidigital number, since it uses as much as digits as its factorization.

39220981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 39220981 is about 6262.6656465119. The cubic root of 39220981 is about 339.7604454430.

The spelling of 39220981 in words is "thirty-nine million, two hundred twenty thousand, nine hundred eighty-one".