1972709261 has 2 divisors, whose sum is σ = 1972709262. Its totient is φ = 1972709260.

The previous prime is 1972709243. The next prime is 1972709269. The reversal of 1972709261 is 1629072791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1935120100 + 37589161 = 43990^2 + 6131^2 .

It is an emirp because it is prime and its reverse (1629072791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1972709261 - 2⁶ = 1972709197 is a prime.

It is a super-2 number, since 2×1972709261² = 7783163656870332242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1972709269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 986354630 + 986354631.

It is an arithmetic number, because the mean of its divisors is an integer number (986354631).

Almost surely, 2^1972709261 is an apocalyptic number.

It is an amenable number.

1972709261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1972709261 is an equidigital number, since it uses as much as digits as its factorization.

1972709261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 1972709261 is about 44415.1917816416. The cubic root of 1972709261 is about 1254.1640885696.

The spelling of 1972709261 in words is "one billion, nine hundred seventy-two million, seven hundred nine thousand, two hundred sixty-one".