7121488757 has 8 divisors (see below), whose sum is σ = 7172285496. Its totient is φ = 7070761152.

The previous prime is 7121488747. The next prime is 7121488763. The reversal of 7121488757 is 7578841217.

It can be written as a sum of positive squares in 4 ways, for example, as 441042001 + 6680446756 = 21001^2 + 81734^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 7121488757 - 2²² = 7117294453 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 (7121488747) 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, 199043 + ... + 232079.

It is an arithmetic number, because the mean of its divisors is an integer number (896535687).

Almost surely, 2^7121488757 is an apocalyptic number.

It is an amenable number.

7121488757 is a deficient number, since it is larger than the sum of its proper divisors (50796739).

7121488757 is a wasteful number, since it uses less digits than its factorization.

7121488757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34567.

The product of its digits is 878080, while the sum is 50.

The square root of 7121488757 is about 84388.9137090886. The cubic root of 7121488757 is about 1923.9344196026.

The spelling of 7121488757 in words is "seven billion, one hundred twenty-one million, four hundred eighty-eight thousand, seven hundred fifty-seven".