1308111981 has 16 divisors (see below), whose sum is σ = 2002851840. Its totient is φ = 751068720.

The previous prime is 1308111977. The next prime is 1308111983. The reversal of 1308111981 is 1891118031.

It is not a de Polignac number, because 1308111981 - 2² = 1308111977 is a prime.

It is a super-2 number, since 2×1308111981² = 3422313909671488722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1308111983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1042525 + ... + 1043778.

It is an arithmetic number, because the mean of its divisors is an integer number (125178240).

Almost surely, 2^1308111981 is an apocalyptic number.

1308111981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1308111981 is a deficient number, since it is larger than the sum of its proper divisors (694739859).

1308111981 is a wasteful number, since it uses less digits than its factorization.

1308111981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2086336.

The product of its (nonzero) digits is 1728, while the sum is 33.

The square root of 1308111981 is about 36167.8307477792. The cubic root of 1308111981 is about 1093.6582694618.

The spelling of 1308111981 in words is "one billion, three hundred eight million, one hundred eleven thousand, nine hundred eighty-one".