999413381 has 2 divisors, whose sum is σ = 999413382. Its totient is φ = 999413380.

The previous prime is 999413377. The next prime is 999413431. The reversal of 999413381 is 183314999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 986525281 + 12888100 = 31409^2 + 3590^2 .

It is a cyclic number.

It is not a de Polignac number, because 999413381 - 2² = 999413377 is a prime.

It is a super-2 number, since 2×999413381² = 1997654212243702322, 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 (999413881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499706690 + 499706691.

It is an arithmetic number, because the mean of its divisors is an integer number (499706691).

Almost surely, 2^999413381 is an apocalyptic number.

It is an amenable number.

999413381 is a deficient number, since it is larger than the sum of its proper divisors (1).

999413381 is an equidigital number, since it uses as much as digits as its factorization.

999413381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 47.

The square root of 999413381 is about 31613.4999802300. The cubic root of 999413381 is about 999.8044220851.

The spelling of 999413381 in words is "nine hundred ninety-nine million, four hundred thirteen thousand, three hundred eighty-one".