1954781155 has 16 divisors (see below), whose sum is σ = 2450248704. Its totient is φ = 1494291040.

The previous prime is 1954781119. The next prime is 1954781197. The reversal of 1954781155 is 5511874591.

It is not a de Polignac number, because 1954781155 - 2¹⁵ = 1954748387 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 (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110322 + ... + 126808.

It is an arithmetic number, because the mean of its divisors is an integer number (153140544).

Almost surely, 2^1954781155 is an apocalyptic number.

1954781155 is a deficient number, since it is larger than the sum of its proper divisors (495467549).

1954781155 is a wasteful number, since it uses less digits than its factorization.

1954781155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17546.

The product of its digits is 252000, while the sum is 46.

The square root of 1954781155 is about 44212.9071086713. The cubic root of 1954781155 is about 1250.3532132496.

The spelling of 1954781155 in words is "one billion, nine hundred fifty-four million, seven hundred eighty-one thousand, one hundred fifty-five".