1981969275 has 96 divisors (see below), whose sum is σ = 3869252352. Its totient is φ = 882547200.

The previous prime is 1981969261. The next prime is 1981969289. The reversal of 1981969275 is 5729691891.

It is an interprime number because it is at equal distance from previous prime (1981969261) and next prime (1981969289).

It is not a de Polignac number, because 1981969275 - 2⁷ = 1981969147 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3034849 + ... + 3035501.

It is an arithmetic number, because the mean of its divisors is an integer number (40304712).

Almost surely, 2^1981969275 is an apocalyptic number.

1981969275 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1981969275 is a deficient number, since it is larger than the sum of its proper divisors (1887283077).

1981969275 is a wasteful number, since it uses less digits than its factorization.

1981969275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 973 (or 968 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 57.

The square root of 1981969275 is about 44519.3135054888. The cubic root of 1981969275 is about 1256.1233995339.

The spelling of 1981969275 in words is "one billion, nine hundred eighty-one million, nine hundred sixty-nine thousand, two hundred seventy-five".