73563121 has 2 divisors, whose sum is σ = 73563122. Its totient is φ = 73563120.

The previous prime is 73563103. The next prime is 73563137. The reversal of 73563121 is 12136537.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52403121 + 21160000 = 7239^2 + 4600^2 .

It is a cyclic number.

It is not a de Polignac number, because 73563121 - 2⁵ = 73563089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 73563121.

It is not a weakly prime, because it can be changed into another prime (73563101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36781560 + 36781561.

It is an arithmetic number, because the mean of its divisors is an integer number (36781561).

Almost surely, 2^73563121 is an apocalyptic number.

It is an amenable number.

73563121 is a deficient number, since it is larger than the sum of its proper divisors (1).

73563121 is an equidigital number, since it uses as much as digits as its factorization.

73563121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3780, while the sum is 28.

The square root of 73563121 is about 8576.8946011945. The cubic root of 73563121 is about 419.0058136631.

Adding to 73563121 its reverse (12136537), we get a palindrome (85699658).

The spelling of 73563121 in words is "seventy-three million, five hundred sixty-three thousand, one hundred twenty-one".