1957229917 has 2 divisors, whose sum is σ = 1957229918. Its totient is φ = 1957229916.

The previous prime is 1957229909. The next prime is 1957229921. The reversal of 1957229917 is 7199227591.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1878268921 + 78960996 = 43339^2 + 8886^2 .

It is an emirp because it is prime and its reverse (7199227591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1957229917 - 2³ = 1957229909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1957229927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 978614958 + 978614959.

It is an arithmetic number, because the mean of its divisors is an integer number (978614959).

Almost surely, 2^1957229917 is an apocalyptic number.

It is an amenable number.

1957229917 is a deficient number, since it is larger than the sum of its proper divisors (1).

1957229917 is an equidigital number, since it uses as much as digits as its factorization.

1957229917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 714420, while the sum is 52.

The square root of 1957229917 is about 44240.5912822150. The cubic root of 1957229917 is about 1250.8751028397.

The spelling of 1957229917 in words is "one billion, nine hundred fifty-seven million, two hundred twenty-nine thousand, nine hundred seventeen".