7172051921 has 2 divisors, whose sum is σ = 7172051922. Its totient is φ = 7172051920.

The previous prime is 7172051899. The next prime is 7172052011. The reversal of 7172051921 is 1291502717.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6487497025 + 684554896 = 80545^2 + 26164^2 .

It is a cyclic number.

It is not a de Polignac number, because 7172051921 - 2¹⁴ = 7172035537 is a prime.

It is not a weakly prime, because it can be changed into another prime (7172056921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3586025960 + 3586025961.

It is an arithmetic number, because the mean of its divisors is an integer number (3586025961).

Almost surely, 2^7172051921 is an apocalyptic number.

It is an amenable number.

7172051921 is a deficient number, since it is larger than the sum of its proper divisors (1).

7172051921 is an equidigital number, since it uses as much as digits as its factorization.

7172051921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8820, while the sum is 35.

The square root of 7172051921 is about 84687.9679824708. The cubic root of 7172051921 is about 1928.4770504218.

The spelling of 7172051921 in words is "seven billion, one hundred seventy-two million, fifty-one thousand, nine hundred twenty-one".