1972251751 has 2 divisors, whose sum is σ = 1972251752. Its totient is φ = 1972251750.

The previous prime is 1972251709. The next prime is 1972251763. The reversal of 1972251751 is 1571522791.

It is a strong prime.

It is an emirp because it is prime and its reverse (1571522791) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1972251751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1972251791) 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, 986125875 + 986125876.

It is an arithmetic number, because the mean of its divisors is an integer number (986125876).

Almost surely, 2^1972251751 is an apocalyptic number.

1972251751 is a deficient number, since it is larger than the sum of its proper divisors (1).

1972251751 is an equidigital number, since it uses as much as digits as its factorization.

1972251751 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 44100, while the sum is 40.

The square root of 1972251751 is about 44410.0411055878. The cubic root of 1972251751 is about 1254.0671259834.

The spelling of 1972251751 in words is "one billion, nine hundred seventy-two million, two hundred fifty-one thousand, seven hundred fifty-one".