1972845551 has 2 divisors, whose sum is σ = 1972845552. Its totient is φ = 1972845550.

The previous prime is 1972845533. The next prime is 1972845557. The reversal of 1972845551 is 1555482791.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1972845551 - 2¹⁸ = 1972583407 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1972845496 and 1972845505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1972845557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 986422775 + 986422776.

It is an arithmetic number, because the mean of its divisors is an integer number (986422776).

Almost surely, 2^1972845551 is an apocalyptic number.

1972845551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1972845551 is an equidigital number, since it uses as much as digits as its factorization.

1972845551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 504000, while the sum is 47.

The square root of 1972845551 is about 44416.7260274775. The cubic root of 1972845551 is about 1254.1929703535.

The spelling of 1972845551 in words is "one billion, nine hundred seventy-two million, eight hundred forty-five thousand, five hundred fifty-one".