73431131 has 2 divisors, whose sum is σ = 73431132. Its totient is φ = 73431130.

The previous prime is 73431121. The next prime is 73431191. The reversal of 73431131 is 13113437.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 73431131 - 2¹⁰ = 73430107 is a prime.

It is a super-2 number, since 2×73431131² = 10784261999878322, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 73431097 and 73431106.

It is not a weakly prime, because it can be changed into another prime (73431101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36715565 + 36715566.

It is an arithmetic number, because the mean of its divisors is an integer number (36715566).

Almost surely, 2^73431131 is an apocalyptic number.

73431131 is a deficient number, since it is larger than the sum of its proper divisors (1).

73431131 is an equidigital number, since it uses as much as digits as its factorization.

73431131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 756, while the sum is 23.

The square root of 73431131 is about 8569.1966367916. The cubic root of 73431131 is about 418.7550644372.

Adding to 73431131 its reverse (13113437), we get a palindrome (86544568).

The spelling of 73431131 in words is "seventy-three million, four hundred thirty-one thousand, one hundred thirty-one".