1971980505 has 32 divisors (see below), whose sum is σ = 3824449920. Its totient is φ = 956111040.

The previous prime is 1971980447. The next prime is 1971980539. The reversal of 1971980505 is 5050891791.

It is not a de Polignac number, because 1971980505 - 2²⁰ = 1970931929 is a prime.

It is a super-2 number, since 2×1971980505² = 7777414224200110050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 662482 + ... + 665451.

It is an arithmetic number, because the mean of its divisors is an integer number (119514060).

Almost surely, 2^1971980505 is an apocalyptic number.

1971980505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1971980505 is a deficient number, since it is larger than the sum of its proper divisors (1852469415).

1971980505 is a wasteful number, since it uses less digits than its factorization.

1971980505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1327958 (or 1327952 counting only the distinct ones).

The product of its (nonzero) digits is 113400, while the sum is 45.

The square root of 1971980505 is about 44406.9871191460. The cubic root of 1971980505 is about 1254.0096322604.

The spelling of 1971980505 in words is "one billion, nine hundred seventy-one million, nine hundred eighty thousand, five hundred five".