2155704517 has 2 divisors, whose sum is σ = 2155704518. Its totient is φ = 2155704516.

The previous prime is 2155704479. The next prime is 2155704547. The reversal of 2155704517 is 7154075512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1256064481 + 899640036 = 35441^2 + 29994^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2155704517 is a prime.

It is a super-2 number, since 2×2155704517² = 9294123929228406578, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2155704547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077852258 + 1077852259.

It is an arithmetic number, because the mean of its divisors is an integer number (1077852259).

Almost surely, 2^2155704517 is an apocalyptic number.

It is an amenable number.

2155704517 is a deficient number, since it is larger than the sum of its proper divisors (1).

2155704517 is an equidigital number, since it uses as much as digits as its factorization.

2155704517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 49000, while the sum is 37.

The square root of 2155704517 is about 46429.5651174981. The cubic root of 2155704517 is about 1291.8033622676.

The spelling of 2155704517 in words is "two billion, one hundred fifty-five million, seven hundred four thousand, five hundred seventeen".