72030961 has 2 divisors, whose sum is σ = 72030962. Its totient is φ = 72030960.

The previous prime is 72030953. The next prime is 72030967. The reversal of 72030961 is 16903027.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58752225 + 13278736 = 7665^2 + 3644^2 .

It is a cyclic number.

It is not a de Polignac number, because 72030961 - 2³ = 72030953 is a prime.

It is not a weakly prime, because it can be changed into another prime (72030967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36015480 + 36015481.

It is an arithmetic number, because the mean of its divisors is an integer number (36015481).

Almost surely, 2^72030961 is an apocalyptic number.

It is an amenable number.

72030961 is a deficient number, since it is larger than the sum of its proper divisors (1).

72030961 is an equidigital number, since it uses as much as digits as its factorization.

72030961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 72030961 is about 8487.1055725730. The cubic root of 72030961 is about 416.0763870606.

Adding to 72030961 its reverse (16903027), we get a palindrome (88933988).

The spelling of 72030961 in words is "seventy-two million, thirty thousand, nine hundred sixty-one".