1951708649 has 4 divisors (see below), whose sum is σ = 2129136720. Its totient is φ = 1774280580.

The previous prime is 1951708643. The next prime is 1951708657. The reversal of 1951708649 is 9468071591.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1951708649 - 2⁸ = 1951708393 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1951708597 and 1951708606.

It is not an unprimeable number, because it can be changed into a prime (1951708643) 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 in 3 ways as a sum of consecutive naturals, for example, 88714019 + ... + 88714040.

It is an arithmetic number, because the mean of its divisors is an integer number (532284180).

Almost surely, 2^1951708649 is an apocalyptic number.

It is an amenable number.

1951708649 is a deficient number, since it is larger than the sum of its proper divisors (177428071).

1951708649 is a wasteful number, since it uses less digits than its factorization.

1951708649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177428070.

The product of its (nonzero) digits is 544320, while the sum is 50.

The square root of 1951708649 is about 44178.1467356882. The cubic root of 1951708649 is about 1249.6977720525.

The spelling of 1951708649 in words is "one billion, nine hundred fifty-one million, seven hundred eight thousand, six hundred forty-nine".