2787901381 has 2 divisors, whose sum is σ = 2787901382. Its totient is φ = 2787901380.

The previous prime is 2787901357. The next prime is 2787901421. The reversal of 2787901381 is 1831097872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1401828481 + 1386072900 = 37441^2 + 37230^2 .

It is a cyclic number.

It is not a de Polignac number, because 2787901381 - 2¹¹ = 2787899333 is a prime.

It is a super-2 number, since 2×2787901381² = 15544788220363414322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2787901321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1393950690 + 1393950691.

It is an arithmetic number, because the mean of its divisors is an integer number (1393950691).

Almost surely, 2^2787901381 is an apocalyptic number.

It is an amenable number.

2787901381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2787901381 is an equidigital number, since it uses as much as digits as its factorization.

2787901381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 46.

The square root of 2787901381 is about 52800.5812562703. The cubic root of 2787901381 is about 1407.4267539680.

The spelling of 2787901381 in words is "two billion, seven hundred eighty-seven million, nine hundred one thousand, three hundred eighty-one".