1945556119 has 4 divisors (see below), whose sum is σ = 2095214296. Its totient is φ = 1795897944.

The previous prime is 1945556111. The next prime is 1945556153. The reversal of 1945556119 is 9116555491.

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

It is a cyclic number.

It is not a de Polignac number, because 1945556119 - 2³ = 1945556111 is a prime.

It is a super-2 number, since 2×1945556119² = 7570377224356684322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1945556111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74829069 + ... + 74829094.

It is an arithmetic number, because the mean of its divisors is an integer number (523803574).

Almost surely, 2^1945556119 is an apocalyptic number.

1945556119 is a deficient number, since it is larger than the sum of its proper divisors (149658177).

1945556119 is a wasteful number, since it uses less digits than its factorization.

1945556119 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149658176.

The product of its digits is 243000, while the sum is 46.

The square root of 1945556119 is about 44108.4585878945. The cubic root of 1945556119 is about 1248.3832150935.

The spelling of 1945556119 in words is "one billion, nine hundred forty-five million, five hundred fifty-six thousand, one hundred nineteen".