73247561 has 4 divisors (see below), whose sum is σ = 73320324. Its totient is φ = 73174800.

The previous prime is 73247557. The next prime is 73247567. The reversal of 73247561 is 16574237.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16574237 = 23 ⋅720619.

It can be written as a sum of positive squares in 2 ways, for example, as 44689225 + 28558336 = 6685^2 + 5344^2 .

It is a cyclic number.

It is not a de Polignac number, because 73247561 - 2² = 73247557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73247567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34850 + ... + 36891.

It is an arithmetic number, because the mean of its divisors is an integer number (18330081).

Almost surely, 2^73247561 is an apocalyptic number.

It is an amenable number.

73247561 is a deficient number, since it is larger than the sum of its proper divisors (72763).

73247561 is a wasteful number, since it uses less digits than its factorization.

73247561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72762.

The product of its digits is 35280, while the sum is 35.

The square root of 73247561 is about 8558.4788952243. The cubic root of 73247561 is about 418.4058255809.

The spelling of 73247561 in words is "seventy-three million, two hundred forty-seven thousand, five hundred sixty-one".