161131203487 has 2 divisors, whose sum is σ = 161131203488. Its totient is φ = 161131203486.

The previous prime is 161131203481. The next prime is 161131203587. The reversal of 161131203487 is 784302131161.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161131203487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161131203481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80565601743 + 80565601744.

It is an arithmetic number, because the mean of its divisors is an integer number (80565601744).

Almost surely, 2^161131203487 is an apocalyptic number.

161131203487 is a deficient number, since it is larger than the sum of its proper divisors (1).

161131203487 is an equidigital number, since it uses as much as digits as its factorization.

161131203487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 37.

The spelling of 161131203487 in words is "one hundred sixty-one billion, one hundred thirty-one million, two hundred three thousand, four hundred eighty-seven".