1997913587 has 2 divisors, whose sum is σ = 1997913588. Its totient is φ = 1997913586.

The previous prime is 1997913571. The next prime is 1997913613. The reversal of 1997913587 is 7853197991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1997913587 - 2⁴ = 1997913571 is a prime.

It is a super-2 number, since 2×1997913587² = 7983317402238413138, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1997903587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 998956793 + 998956794.

It is an arithmetic number, because the mean of its divisors is an integer number (998956794).

Almost surely, 2^1997913587 is an apocalyptic number.

1997913587 is a deficient number, since it is larger than the sum of its proper divisors (1).

1997913587 is an equidigital number, since it uses as much as digits as its factorization.

1997913587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4286520, while the sum is 59.

The square root of 1997913587 is about 44698.0266566657. The cubic root of 1997913587 is about 1259.4827781806.

The spelling of 1997913587 in words is "one billion, nine hundred ninety-seven million, nine hundred thirteen thousand, five hundred eighty-seven".