1981879755 has 32 divisors (see below), whose sum is σ = 3415633920. Its totient is φ = 978426240.

The previous prime is 1981879741. The next prime is 1981879769. The reversal of 1981879755 is 5579781891.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1981879741) and next prime (1981879769).

It is not a de Polignac number, because 1981879755 - 2⁹ = 1981879243 is a prime.

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, 81960 + ... + 103349.

It is an arithmetic number, because the mean of its divisors is an integer number (106738560).

Almost surely, 2^1981879755 is an apocalyptic number.

1981879755 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1981879755 is a deficient number, since it is larger than the sum of its proper divisors (1433754165).

1981879755 is a wasteful number, since it uses less digits than its factorization.

1981879755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185371.

The product of its digits is 6350400, while the sum is 60.

The square root of 1981879755 is about 44518.3080877969. The cubic root of 1981879755 is about 1256.1044873907.

The spelling of 1981879755 in words is "one billion, nine hundred eighty-one million, eight hundred seventy-nine thousand, seven hundred fifty-five".