81596949 has 8 divisors (see below), whose sum is σ = 124338240. Its totient is φ = 46626816.

The previous prime is 81596903. The next prime is 81596959. The reversal of 81596949 is 94969518.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81596949 - 2⁸ = 81596693 is a prime.

It is a super-2 number, since 2×81596949² = 13316124172217202, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81596959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1942764 + ... + 1942805.

It is an arithmetic number, because the mean of its divisors is an integer number (15542280).

Almost surely, 2^81596949 is an apocalyptic number.

It is an amenable number.

81596949 is a deficient number, since it is larger than the sum of its proper divisors (42741291).

81596949 is a wasteful number, since it uses less digits than its factorization.

81596949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3885579.

The product of its digits is 699840, while the sum is 51.

The square root of 81596949 is about 9033.1029552419. The cubic root of 81596949 is about 433.7351711718.

The spelling of 81596949 in words is "eighty-one million, five hundred ninety-six thousand, nine hundred forty-nine".