73218786131 has 2 divisors, whose sum is σ = 73218786132. Its totient is φ = 73218786130.

The previous prime is 73218786119. The next prime is 73218786149. The reversal of 73218786131 is 13168781237.

It is a weak prime.

It is an emirp because it is prime and its reverse (13168781237) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73218786131 is a prime.

It is a super-2 number, since 2×73218786131² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (73218786031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36609393065 + 36609393066.

It is an arithmetic number, because the mean of its divisors is an integer number (36609393066).

Almost surely, 2^73218786131 is an apocalyptic number.

73218786131 is a deficient number, since it is larger than the sum of its proper divisors (1).

73218786131 is an equidigital number, since it uses as much as digits as its factorization.

73218786131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 47.

The spelling of 73218786131 in words is "seventy-three billion, two hundred eighteen million, seven hundred eighty-six thousand, one hundred thirty-one".