285397387949 has 2 divisors, whose sum is σ = 285397387950. Its totient is φ = 285397387948.

The previous prime is 285397387937. The next prime is 285397387967. The reversal of 285397387949 is 949783793582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 243354756100 + 42042631849 = 493310^2 + 205043^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-285397387949 is a prime.

It is a super-2 number, since 2×285397387949² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (285397387549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142698693974 + 142698693975.

It is an arithmetic number, because the mean of its divisors is an integer number (142698693975).

Almost surely, 2^285397387949 is an apocalyptic number.

It is an amenable number.

285397387949 is a deficient number, since it is larger than the sum of its proper divisors (1).

285397387949 is an equidigital number, since it uses as much as digits as its factorization.

285397387949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 823011840, while the sum is 74.

The spelling of 285397387949 in words is "two hundred eighty-five billion, three hundred ninety-seven million, three hundred eighty-seven thousand, nine hundred forty-nine".