72355991 has 2 divisors, whose sum is σ = 72355992. Its totient is φ = 72355990.

The previous prime is 72355981. The next prime is 72356051. The reversal of 72355991 is 19955327.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72355991 is a prime.

It is a super-4 number, since 4×72355991⁴ (a number of 33 digits) contains 4444 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 (72355931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36177995 + 36177996.

It is an arithmetic number, because the mean of its divisors is an integer number (36177996).

Almost surely, 2^72355991 is an apocalyptic number.

72355991 is a deficient number, since it is larger than the sum of its proper divisors (1).

72355991 is an equidigital number, since it uses as much as digits as its factorization.

72355991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 85050, while the sum is 41.

The square root of 72355991 is about 8506.2324797762. The cubic root of 72355991 is about 416.7012776227.

The spelling of 72355991 in words is "seventy-two million, three hundred fifty-five thousand, nine hundred ninety-one".