994811381 has 2 divisors, whose sum is σ = 994811382. Its totient is φ = 994811380.

The previous prime is 994811351. The next prime is 994811393. The reversal of 994811381 is 183118499.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 903303025 + 91508356 = 30055^2 + 9566^2 .

It is a cyclic number.

It is not a de Polignac number, because 994811381 - 2²² = 990617077 is a prime.

It is a super-2 number, since 2×994811381² = 1979299367534254322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (994811351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 497405690 + 497405691.

It is an arithmetic number, because the mean of its divisors is an integer number (497405691).

Almost surely, 2^994811381 is an apocalyptic number.

It is an amenable number.

994811381 is a deficient number, since it is larger than the sum of its proper divisors (1).

994811381 is an equidigital number, since it uses as much as digits as its factorization.

994811381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 44.

The square root of 994811381 is about 31540.6306373224. The cubic root of 994811381 is about 998.2674603733.

The spelling of 994811381 in words is "nine hundred ninety-four million, eight hundred eleven thousand, three hundred eighty-one".