80961749 has 4 divisors (see below), whose sum is σ = 88321920. Its totient is φ = 73601580.

The previous prime is 80961743. The next prime is 80961761. The reversal of 80961749 is 94716908.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80961749 is a prime.

It is a super-2 number, since 2×80961749² = 13109609602278002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80961743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3680069 + ... + 3680090.

It is an arithmetic number, because the mean of its divisors is an integer number (22080480).

Almost surely, 2^80961749 is an apocalyptic number.

It is an amenable number.

80961749 is a deficient number, since it is larger than the sum of its proper divisors (7360171).

80961749 is a wasteful number, since it uses less digits than its factorization.

80961749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7360170.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 80961749 is about 8997.8746935040. The cubic root of 80961749 is about 432.6067523582.

The spelling of 80961749 in words is "eighty million, nine hundred sixty-one thousand, seven hundred forty-nine".