1957485221 has 2 divisors, whose sum is σ = 1957485222. Its totient is φ = 1957485220.

The previous prime is 1957485217. The next prime is 1957485253. The reversal of 1957485221 is 1225847591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1895296225 + 62188996 = 43535^2 + 7886^2 .

It is an emirp because it is prime and its reverse (1225847591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1957485221 - 2² = 1957485217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1957485821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 978742610 + 978742611.

It is an arithmetic number, because the mean of its divisors is an integer number (978742611).

Almost surely, 2^1957485221 is an apocalyptic number.

It is an amenable number.

1957485221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1957485221 is an equidigital number, since it uses as much as digits as its factorization.

1957485221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 201600, while the sum is 44.

The square root of 1957485221 is about 44243.4765926006. The cubic root of 1957485221 is about 1250.9294891486.

The spelling of 1957485221 in words is "one billion, nine hundred fifty-seven million, four hundred eighty-five thousand, two hundred twenty-one".