1956825881 has 2 divisors, whose sum is σ = 1956825882. Its totient is φ = 1956825880.

The previous prime is 1956825847. The next prime is 1956825887. The reversal of 1956825881 is 1885286591.

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., 1709078281 + 247747600 = 41341^2 + 15740^2 .

It is an emirp because it is prime and its reverse (1885286591) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1956825881 is a prime.

It is a super-2 number, since 2×1956825881² = 7658335057102852322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1956825887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 978412940 + 978412941.

It is an arithmetic number, because the mean of its divisors is an integer number (978412941).

Almost surely, 2^1956825881 is an apocalyptic number.

It is an amenable number.

1956825881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1956825881 is an equidigital number, since it uses as much as digits as its factorization.

1956825881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1382400, while the sum is 53.

The square root of 1956825881 is about 44236.0246970724. The cubic root of 1956825881 is about 1250.7890231292.

The spelling of 1956825881 in words is "one billion, nine hundred fifty-six million, eight hundred twenty-five thousand, eight hundred eighty-one".