72970949 has 2 divisors, whose sum is σ = 72970950. Its totient is φ = 72970948.

The previous prime is 72970943. The next prime is 72970951. The reversal of 72970949 is 94907927.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57486724 + 15484225 = 7582^2 + 3935^2 .

It is a cyclic number.

It is not a de Polignac number, because 72970949 - 2²⁰ = 71922373 is a prime.

Together with 72970951, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72970943) 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, 36485474 + 36485475.

It is an arithmetic number, because the mean of its divisors is an integer number (36485475).

Almost surely, 2^72970949 is an apocalyptic number.

It is an amenable number.

72970949 is a deficient number, since it is larger than the sum of its proper divisors (1).

72970949 is an equidigital number, since it uses as much as digits as its factorization.

72970949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 285768, while the sum is 47.

The square root of 72970949 is about 8542.3034949597. The cubic root of 72970949 is about 417.8784721073.

The spelling of 72970949 in words is "seventy-two million, nine hundred seventy thousand, nine hundred forty-nine".