72187541 has 2 divisors, whose sum is σ = 72187542. Its totient is φ = 72187540.

The previous prime is 72187487. The next prime is 72187567. The reversal of 72187541 is 14578127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55204900 + 16982641 = 7430^2 + 4121^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72187541 is a prime.

It is a super-2 number, since 2×72187541² = 10422082151253362, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72187741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36093770 + 36093771.

It is an arithmetic number, because the mean of its divisors is an integer number (36093771).

Almost surely, 2^72187541 is an apocalyptic number.

It is an amenable number.

72187541 is a deficient number, since it is larger than the sum of its proper divisors (1).

72187541 is an equidigital number, since it uses as much as digits as its factorization.

72187541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15680, while the sum is 35.

The square root of 72187541 is about 8496.3251467914. The cubic root of 72187541 is about 416.3776560790.

The spelling of 72187541 in words is "seventy-two million, one hundred eighty-seven thousand, five hundred forty-one".