1951791955 has 4 divisors (see below), whose sum is σ = 2342150352. Its totient is φ = 1561433560.

The previous prime is 1951791911. The next prime is 1951791971. The reversal of 1951791955 is 5591971591.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1951791955 - 2¹³ = 1951783763 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 195179191 + ... + 195179200.

It is an arithmetic number, because the mean of its divisors is an integer number (585537588).

Almost surely, 2^1951791955 is an apocalyptic number.

1951791955 is a deficient number, since it is larger than the sum of its proper divisors (390358397).

1951791955 is an equidigital number, since it uses as much as digits as its factorization.

1951791955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390358396.

The product of its digits is 637875, while the sum is 52.

The square root of 1951791955 is about 44179.0895673508. The cubic root of 1951791955 is about 1249.7155523432.

The spelling of 1951791955 in words is "one billion, nine hundred fifty-one million, seven hundred ninety-one thousand, nine hundred fifty-five".