83745197531 has 2 divisors, whose sum is σ = 83745197532. Its totient is φ = 83745197530.

The previous prime is 83745197477. The next prime is 83745197533. The reversal of 83745197531 is 13579154738.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83745197531 is a prime.

It is a super-2 number, since 2×83745197531² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 83745197533, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (83745197533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41872598765 + 41872598766.

It is an arithmetic number, because the mean of its divisors is an integer number (41872598766).

Almost surely, 2^83745197531 is an apocalyptic number.

83745197531 is a deficient number, since it is larger than the sum of its proper divisors (1).

83745197531 is an equidigital number, since it uses as much as digits as its factorization.

83745197531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3175200, while the sum is 53.

The spelling of 83745197531 in words is "eighty-three billion, seven hundred forty-five million, one hundred ninety-seven thousand, five hundred thirty-one".