83981061 has 12 divisors (see below), whose sum is σ = 121426188. Its totient is φ = 55931904.

The previous prime is 83981059. The next prime is 83981063. The reversal of 83981061 is 16018938.

It is an interprime number because it is at equal distance from previous prime (83981059) and next prime (83981063).

It can be written as a sum of positive squares in 2 ways, for example, as 52272900 + 31708161 = 7230^2 + 5631^2 .

It is not a de Polignac number, because 83981061 - 2¹ = 83981059 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83981063) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6331 + ... + 14423.

It is an arithmetic number, because the mean of its divisors is an integer number (10118849).

Almost surely, 2^83981061 is an apocalyptic number.

It is an amenable number.

83981061 is a deficient number, since it is larger than the sum of its proper divisors (37445127).

83981061 is a wasteful number, since it uses less digits than its factorization.

83981061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9252 (or 9249 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 83981061 is about 9164.1181245115. The cubic root of 83981061 is about 437.9189973430.

Adding to 83981061 its reverse (16018938), we get a palindrome (99999999).

The spelling of 83981061 in words is "eighty-three million, nine hundred eighty-one thousand, sixty-one".