7305121157 has 4 divisors (see below), whose sum is σ = 7387201260. Its totient is φ = 7223041056.

The previous prime is 7305121151. The next prime is 7305121189. The reversal of 7305121157 is 7511215037.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1658199841 + 5646921316 = 40721^2 + 75146^2 .

It is a cyclic number.

It is not a de Polignac number, because 7305121157 - 2⁶ = 7305121093 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 (7305121151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41039918 + ... + 41040095.

It is an arithmetic number, because the mean of its divisors is an integer number (1846800315).

Almost surely, 2^7305121157 is an apocalyptic number.

It is an amenable number.

7305121157 is a deficient number, since it is larger than the sum of its proper divisors (82080103).

7305121157 is an equidigital number, since it uses as much as digits as its factorization.

7305121157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82080102.

The product of its (nonzero) digits is 7350, while the sum is 32.

The square root of 7305121157 is about 85470.0015034515. The cubic root of 7305121157 is about 1940.3309348823.

The spelling of 7305121157 in words is "seven billion, three hundred five million, one hundred twenty-one thousand, one hundred fifty-seven".