1956820149 has 12 divisors (see below), whose sum is σ = 2835728896. Its totient is φ = 1300295592.

The previous prime is 1956820093. The next prime is 1956820169. The reversal of 1956820149 is 9410286591.

It is not a de Polignac number, because 1956820149 - 2⁹ = 1956819637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1956820169) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 351349 + ... + 356874.

Almost surely, 2^1956820149 is an apocalyptic number.

It is an amenable number.

1956820149 is a deficient number, since it is larger than the sum of its proper divisors (878908747).

1956820149 is a wasteful number, since it uses less digits than its factorization.

1956820149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708536 (or 708533 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 1956820149 is about 44235.9599082014. The cubic root of 1956820149 is about 1250.7878018436.

The spelling of 1956820149 in words is "one billion, nine hundred fifty-six million, eight hundred twenty thousand, one hundred forty-nine".