8129009749 has 16 divisors (see below), whose sum is σ = 9613728000. Its totient is φ = 6725303424.

The previous prime is 8129009747. The next prime is 8129009789. The reversal of 8129009749 is 9479009218.

It is not a de Polignac number, because 8129009749 - 2¹ = 8129009747 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8129009741) 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, 1092289 + ... + 1099705.

It is an arithmetic number, because the mean of its divisors is an integer number (600858000).

Almost surely, 2^8129009749 is an apocalyptic number.

It is an amenable number.

8129009749 is a deficient number, since it is larger than the sum of its proper divisors (1484718251).

8129009749 is a wasteful number, since it uses less digits than its factorization.

8129009749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12852.

The product of its (nonzero) digits is 326592, while the sum is 49.

The square root of 8129009749 is about 90161.0212286884. The cubic root of 8129009749 is about 2010.6935346728.

It can be divided in two parts, 812900 and 9749, that added together give a square (822649 = 907²).

The spelling of 8129009749 in words is "eight billion, one hundred twenty-nine million, nine thousand, seven hundred forty-nine".