1955390971 has 2 divisors, whose sum is σ = 1955390972. Its totient is φ = 1955390970.

The previous prime is 1955390951. The next prime is 1955390981. The reversal of 1955390971 is 1790935591.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1955390971 is a prime.

It is not a weakly prime, because it can be changed into another prime (1955390951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 977695485 + 977695486.

It is an arithmetic number, because the mean of its divisors is an integer number (977695486).

Almost surely, 2^1955390971 is an apocalyptic number.

1955390971 is a deficient number, since it is larger than the sum of its proper divisors (1).

1955390971 is an equidigital number, since it uses as much as digits as its factorization.

1955390971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 382725, while the sum is 49.

The square root of 1955390971 is about 44219.8029281000. The cubic root of 1955390971 is about 1250.4832203211.

The spelling of 1955390971 in words is "one billion, nine hundred fifty-five million, three hundred ninety thousand, nine hundred seventy-one".