1970621551 has 2 divisors, whose sum is σ = 1970621552. Its totient is φ = 1970621550.

The previous prime is 1970621533. The next prime is 1970621599. The reversal of 1970621551 is 1551260791.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1970621551 - 2¹⁹ = 1970097263 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1970621551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1970621951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 985310775 + 985310776.

It is an arithmetic number, because the mean of its divisors is an integer number (985310776).

Almost surely, 2^1970621551 is an apocalyptic number.

1970621551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1970621551 is an equidigital number, since it uses as much as digits as its factorization.

1970621551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18900, while the sum is 37.

The square root of 1970621551 is about 44391.6833539797. The cubic root of 1970621551 is about 1253.7215068605.

The spelling of 1970621551 in words is "one billion, nine hundred seventy million, six hundred twenty-one thousand, five hundred fifty-one".