72921049 has 2 divisors, whose sum is σ = 72921050. Its totient is φ = 72921048.

The previous prime is 72920999. The next prime is 72921073. The reversal of 72921049 is 94012927.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72795024 + 126025 = 8532^2 + 355^2 .

It is a cyclic number.

It is not a de Polignac number, because 72921049 - 2⁷ = 72920921 is a prime.

It is not a weakly prime, because it can be changed into another prime (72922049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36460524 + 36460525.

It is an arithmetic number, because the mean of its divisors is an integer number (36460525).

Almost surely, 2^72921049 is an apocalyptic number.

It is an amenable number.

72921049 is a deficient number, since it is larger than the sum of its proper divisors (1).

72921049 is an equidigital number, since it uses as much as digits as its factorization.

72921049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 72921049 is about 8539.3822376095. The cubic root of 72921049 is about 417.7831972480.

The spelling of 72921049 in words is "seventy-two million, nine hundred twenty-one thousand, forty-nine".