1955978351 has 16 divisors (see below), whose sum is σ = 2152093440. Its totient is φ = 1769454720.

The previous prime is 1955978347. The next prime is 1955978383. The reversal of 1955978351 is 1538795591.

It is a cyclic number.

It is not a de Polignac number, because 1955978351 - 2² = 1955978347 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1955978293 and 1955978302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1955978551) 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 in 15 ways as a sum of consecutive naturals, for example, 277511 + ... + 284471.

It is an arithmetic number, because the mean of its divisors is an integer number (134505840).

Almost surely, 2^1955978351 is an apocalyptic number.

1955978351 is a deficient number, since it is larger than the sum of its proper divisors (196115089).

1955978351 is a wasteful number, since it uses less digits than its factorization.

1955978351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7646.

The product of its digits is 1701000, while the sum is 53.

The square root of 1955978351 is about 44226.4440239095. Note that the first 3 decimals coincide. The cubic root of 1955978351 is about 1250.6084186933.

The spelling of 1955978351 in words is "one billion, nine hundred fifty-five million, nine hundred seventy-eight thousand, three hundred fifty-one".