73431261 has 6 divisors (see below), whose sum is σ = 106067390. Its totient is φ = 48954168.

The previous prime is 73431247. The next prime is 73431269. The reversal of 73431261 is 16213437.

It can be written as a sum of positive squares in only one way, i.e., 66928761 + 6502500 = 8181^2 + 2550^2 .

It is not a de Polignac number, because 73431261 - 2¹⁷ = 73300189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73431269) 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 in 5 ways as a sum of consecutive naturals, for example, 4079506 + ... + 4079523.

Almost surely, 2^73431261 is an apocalyptic number.

It is an amenable number.

73431261 is a deficient number, since it is larger than the sum of its proper divisors (32636129).

73431261 is a wasteful number, since it uses less digits than its factorization.

73431261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8159035 (or 8159032 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 73431261 is about 8569.2042220967. The cubic root of 73431261 is about 418.7553115536.

Adding to 73431261 its reverse (16213437), we get a palindrome (89644698).

The spelling of 73431261 in words is "seventy-three million, four hundred thirty-one thousand, two hundred sixty-one".