7925921261 has 2 divisors, whose sum is σ = 7925921262. Its totient is φ = 7925921260.

The previous prime is 7925921257. The next prime is 7925921303. The reversal of 7925921261 is 1621295297.

7925921261 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6420015625 + 1505905636 = 80125^2 + 38806^2 .

It is a cyclic number.

It is not a de Polignac number, because 7925921261 - 2² = 7925921257 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7925921221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3962960630 + 3962960631.

It is an arithmetic number, because the mean of its divisors is an integer number (3962960631).

Almost surely, 2^7925921261 is an apocalyptic number.

It is an amenable number.

7925921261 is a deficient number, since it is larger than the sum of its proper divisors (1).

7925921261 is an equidigital number, since it uses as much as digits as its factorization.

7925921261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 44.

The square root of 7925921261 is about 89027.6432407373. The cubic root of 7925921261 is about 1993.8076187447.

The spelling of 7925921261 in words is "seven billion, nine hundred twenty-five million, nine hundred twenty-one thousand, two hundred sixty-one".