73781131 has 2 divisors, whose sum is σ = 73781132. Its totient is φ = 73781130.

The previous prime is 73781087. The next prime is 73781143. The reversal of 73781131 is 13118737.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73781131 is a prime.

It is a super-2 number, since 2×73781131² = 10887310583278322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 73781093 and 73781102.

It is not a weakly prime, because it can be changed into another prime (73781431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36890565 + 36890566.

It is an arithmetic number, because the mean of its divisors is an integer number (36890566).

Almost surely, 2^73781131 is an apocalyptic number.

73781131 is a deficient number, since it is larger than the sum of its proper divisors (1).

73781131 is an equidigital number, since it uses as much as digits as its factorization.

73781131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528, while the sum is 31.

The square root of 73781131 is about 8589.5943443215. The cubic root of 73781131 is about 419.4193241561.

Adding to 73781131 its reverse (13118737), we get a palindrome (86899868).

The spelling of 73781131 in words is "seventy-three million, seven hundred eighty-one thousand, one hundred thirty-one".