1972509887 has 2 divisors, whose sum is σ = 1972509888. Its totient is φ = 1972509886.

The previous prime is 1972509883. The next prime is 1972510013. The reversal of 1972509887 is 7889052791.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1972509887 - 2² = 1972509883 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1972509883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 986254943 + 986254944.

It is an arithmetic number, because the mean of its divisors is an integer number (986254944).

Almost surely, 2^1972509887 is an apocalyptic number.

1972509887 is a deficient number, since it is larger than the sum of its proper divisors (1).

1972509887 is an equidigital number, since it uses as much as digits as its factorization.

1972509887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2540160, while the sum is 56.

The square root of 1972509887 is about 44412.9472901765. The cubic root of 1972509887 is about 1254.1218359951.

The spelling of 1972509887 in words is "one billion, nine hundred seventy-two million, five hundred nine thousand, eight hundred eighty-seven".