83691361 has 16 divisors (see below), whose sum is σ = 94545360. Its totient is φ = 73543680.

The previous prime is 83691353. The next prime is 83691367. The reversal of 83691361 is 16319638.

It can be written as a sum of positive squares in 8 ways, for example, as 2421136 + 81270225 = 1556^2 + 9015^2 .

It is a cyclic number.

It is not a de Polignac number, because 83691361 - 2³ = 83691353 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 83691361.

It is not an unprimeable number, because it can be changed into a prime (83691367) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26001 + ... + 29041.

It is an arithmetic number, because the mean of its divisors is an integer number (5909085).

Almost surely, 2^83691361 is an apocalyptic number.

It is an amenable number.

83691361 is a deficient number, since it is larger than the sum of its proper divisors (10853999).

83691361 is a wasteful number, since it uses less digits than its factorization.

83691361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3156.

The product of its digits is 23328, while the sum is 37.

The square root of 83691361 is about 9148.2982570531. The cubic root of 83691361 is about 437.4148706202.

It can be divided in two parts, 8369 and 1361, that added together give a triangular number (9730 = T₁₃₉).

The spelling of 83691361 in words is "eighty-three million, six hundred ninety-one thousand, three hundred sixty-one".