1981880699 has 2 divisors, whose sum is σ = 1981880700. Its totient is φ = 1981880698.

The previous prime is 1981880687. The next prime is 1981880711. The reversal of 1981880699 is 9960881891.

It is a balanced prime because it is at equal distance from previous prime (1981880687) and next prime (1981880711).

It is a cyclic number.

It is not a de Polignac number, because 1981880699 - 2²⁸ = 1713445243 is a prime.

It is a super-2 number, since 2×1981880699² = 7855702210137457202, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1981880639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990940349 + 990940350.

It is an arithmetic number, because the mean of its divisors is an integer number (990940350).

Almost surely, 2^1981880699 is an apocalyptic number.

1981880699 is a deficient number, since it is larger than the sum of its proper divisors (1).

1981880699 is an equidigital number, since it uses as much as digits as its factorization.

1981880699 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2239488, while the sum is 59.

The square root of 1981880699 is about 44518.3186901752. The cubic root of 1981880699 is about 1256.1046868247.

The spelling of 1981880699 in words is "one billion, nine hundred eighty-one million, eight hundred eighty thousand, six hundred ninety-nine".