1987261319 has 12 divisors (see below), whose sum is σ = 2100294504. Its totient is φ = 1880034192.

The previous prime is 1987261303. The next prime is 1987261343. The reversal of 1987261319 is 9131627891.

It is not a de Polignac number, because 1987261319 - 2⁴ = 1987261303 is a prime.

It is a super-2 number, since 2×1987261319² = 7898415099987239522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987261369) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 284264 + ... + 291170.

It is an arithmetic number, because the mean of its divisors is an integer number (175024542).

Almost surely, 2^1987261319 is an apocalyptic number.

1987261319 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1987261319 is a deficient number, since it is larger than the sum of its proper divisors (113033185).

1987261319 is an equidigital number, since it uses as much as digits as its factorization.

1987261319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7742 (or 7723 counting only the distinct ones).

The product of its digits is 163296, while the sum is 47.

The square root of 1987261319 is about 44578.7092567741. The cubic root of 1987261319 is about 1257.2403950892.

The spelling of 1987261319 in words is "one billion, nine hundred eighty-seven million, two hundred sixty-one thousand, three hundred nineteen".