349961987 has 2 divisors, whose sum is σ = 349961988. Its totient is φ = 349961986.

The previous prime is 349961959. The next prime is 349962013. The reversal of 349961987 is 789169943.

It is a strong prime.

It is an emirp because it is prime and its reverse (789169943) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-349961987 is a prime.

It is not a weakly prime, because it can be changed into another prime (349961957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 174980993 + 174980994.

It is an arithmetic number, because the mean of its divisors is an integer number (174980994).

Almost surely, 2^349961987 is an apocalyptic number.

349961987 is a deficient number, since it is larger than the sum of its proper divisors (1).

349961987 is an equidigital number, since it uses as much as digits as its factorization.

349961987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2939328, while the sum is 56.

The square root of 349961987 is about 18707.2709661244. The cubic root of 349961987 is about 704.7043590479.

The spelling of 349961987 in words is "three hundred forty-nine million, nine hundred sixty-one thousand, nine hundred eighty-seven".