131918693 has 2 divisors, whose sum is σ = 131918694. Its totient is φ = 131918692.

The previous prime is 131918681. The next prime is 131918719. The reversal of 131918693 is 396819131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131836324 + 82369 = 11482^2 + 287^2 .

It is a cyclic number.

It is not a de Polignac number, because 131918693 - 2⁶ = 131918629 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131918693.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131918603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65959346 + 65959347.

It is an arithmetic number, because the mean of its divisors is an integer number (65959347).

Almost surely, 2^131918693 is an apocalyptic number.

It is an amenable number.

131918693 is a deficient number, since it is larger than the sum of its proper divisors (1).

131918693 is an equidigital number, since it uses as much as digits as its factorization.

131918693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 41.

The square root of 131918693 is about 11485.5863150298. The cubic root of 131918693 is about 509.0597735123.

The spelling of 131918693 in words is "one hundred thirty-one million, nine hundred eighteen thousand, six hundred ninety-three".