7121748309 has 16 divisors (see below), whose sum is σ = 10234738752. Its totient is φ = 4378912128.

The previous prime is 7121748299. The next prime is 7121748377. The reversal of 7121748309 is 9038471217.

It is not a de Polignac number, because 7121748309 - 2¹² = 7121744213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7121728309) 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, 30007 + ... + 123060.

It is an arithmetic number, because the mean of its divisors is an integer number (639671172).

Almost surely, 2^7121748309 is an apocalyptic number.

It is an amenable number.

7121748309 is a deficient number, since it is larger than the sum of its proper divisors (3112990443).

7121748309 is a wasteful number, since it uses less digits than its factorization.

7121748309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154276.

The product of its (nonzero) digits is 84672, while the sum is 42.

The square root of 7121748309 is about 84390.4515274092. The cubic root of 7121748309 is about 1923.9577927566.

The spelling of 7121748309 in words is "seven billion, one hundred twenty-one million, seven hundred forty-eight thousand, three hundred nine".