72974981 has 2 divisors, whose sum is σ = 72974982. Its totient is φ = 72974980.

The previous prime is 72974977. The next prime is 72975017. The reversal of 72974981 is 18947927.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45778756 + 27196225 = 6766^2 + 5215^2 .

It is an emirp because it is prime and its reverse (18947927) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72974981 - 2² = 72974977 is a prime.

It is a super-2 number, since 2×72974981² = 10650695703900722, which contains 22 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 (72974281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36487490 + 36487491.

It is an arithmetic number, because the mean of its divisors is an integer number (36487491).

Almost surely, 2^72974981 is an apocalyptic number.

It is an amenable number.

72974981 is a deficient number, since it is larger than the sum of its proper divisors (1).

72974981 is an equidigital number, since it uses as much as digits as its factorization.

72974981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016, while the sum is 47.

The square root of 72974981 is about 8542.5394936166. The cubic root of 72974981 is about 417.8861685719.

The spelling of 72974981 in words is "seventy-two million, nine hundred seventy-four thousand, nine hundred eighty-one".