8404379261 has 2 divisors, whose sum is σ = 8404379262. Its totient is φ = 8404379260.

The previous prime is 8404379257. The next prime is 8404379287. The reversal of 8404379261 is 1629734048.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5377288900 + 3027090361 = 73330^2 + 55019^2 .

It is a cyclic number.

It is not a de Polignac number, because 8404379261 - 2² = 8404379257 is a prime.

It is a super-2 number, since 2×8404379261² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8404379251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4202189630 + 4202189631.

It is an arithmetic number, because the mean of its divisors is an integer number (4202189631).

Almost surely, 2^8404379261 is an apocalyptic number.

It is an amenable number.

8404379261 is a deficient number, since it is larger than the sum of its proper divisors (1).

8404379261 is an equidigital number, since it uses as much as digits as its factorization.

8404379261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 8404379261 is about 91675.4016135190. The cubic root of 8404379261 is about 2033.1459113791.

The spelling of 8404379261 in words is "eight billion, four hundred four million, three hundred seventy-nine thousand, two hundred sixty-one".