1945214509 has 16 divisors (see below), whose sum is σ = 2346007680. Its totient is φ = 1575590400.

The previous prime is 1945214507. The next prime is 1945214549. The reversal of 1945214509 is 9054125491.

It is a cyclic number.

It is not a de Polignac number, because 1945214509 - 2¹ = 1945214507 is a prime.

It is a super-2 number, since 2×1945214509² = 7567718972048222162, 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 (1945214501) 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, 35097 + ... + 71569.

It is an arithmetic number, because the mean of its divisors is an integer number (146625480).

Almost surely, 2^1945214509 is an apocalyptic number.

1945214509 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1945214509 is a deficient number, since it is larger than the sum of its proper divisors (400793171).

1945214509 is a wasteful number, since it uses less digits than its factorization.

1945214509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36900.

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 1945214509 is about 44104.5860313868. The cubic root of 1945214509 is about 1248.3101451285.

The spelling of 1945214509 in words is "one billion, nine hundred forty-five million, two hundred fourteen thousand, five hundred nine".