1987020311 has 2 divisors, whose sum is σ = 1987020312. Its totient is φ = 1987020310.

The previous prime is 1987020257. The next prime is 1987020341. The reversal of 1987020311 is 1130207891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1987020311 - 2¹⁴ = 1987003927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1987020341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 993510155 + 993510156.

It is an arithmetic number, because the mean of its divisors is an integer number (993510156).

Almost surely, 2^1987020311 is an apocalyptic number.

1987020311 is a deficient number, since it is larger than the sum of its proper divisors (1).

1987020311 is an equidigital number, since it uses as much as digits as its factorization.

1987020311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 1987020311 is about 44576.0060009867. The cubic root of 1987020311 is about 1257.1895684834.

The spelling of 1987020311 in words is "one billion, nine hundred eighty-seven million, twenty thousand, three hundred eleven".