308920949 has 2 divisors, whose sum is σ = 308920950. Its totient is φ = 308920948.

The previous prime is 308920919. The next prime is 308920951. The reversal of 308920949 is 949029803.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 285948100 + 22972849 = 16910^2 + 4793^2 .

It is a cyclic number.

It is not a de Polignac number, because 308920949 - 2²⁰ = 307872373 is a prime.

Together with 308920951, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (308920919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154460474 + 154460475.

It is an arithmetic number, because the mean of its divisors is an integer number (154460475).

Almost surely, 2^308920949 is an apocalyptic number.

It is an amenable number.

308920949 is a deficient number, since it is larger than the sum of its proper divisors (1).

308920949 is an equidigital number, since it uses as much as digits as its factorization.

308920949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 308920949 is about 17576.1471602852. The cubic root of 308920949 is about 676.0037733354.

The spelling of 308920949 in words is "three hundred eight million, nine hundred twenty thousand, nine hundred forty-nine".