1955257813 has 2 divisors, whose sum is σ = 1955257814. Its totient is φ = 1955257812.

The previous prime is 1955257783. The next prime is 1955257819. The reversal of 1955257813 is 3187525591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1935384049 + 19873764 = 43993^2 + 4458^2 .

It is a cyclic number.

It is not a de Polignac number, because 1955257813 - 2²¹ = 1953160661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1955257819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 977628906 + 977628907.

It is an arithmetic number, because the mean of its divisors is an integer number (977628907).

Almost surely, 2^1955257813 is an apocalyptic number.

It is an amenable number.

1955257813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1955257813 is an equidigital number, since it uses as much as digits as its factorization.

1955257813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 378000, while the sum is 46.

The square root of 1955257813 is about 44218.2972648201. The cubic root of 1955257813 is about 1250.4548345870.

The spelling of 1955257813 in words is "one billion, nine hundred fifty-five million, two hundred fifty-seven thousand, eight hundred thirteen".