1945677949 has 4 divisors (see below), whose sum is σ = 1969119936. Its totient is φ = 1922235964.

The previous prime is 1945677913. The next prime is 1945677959. The reversal of 1945677949 is 9497765491.

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 1945677949 - 2¹⁵ = 1945645181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1945677959) 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 3 ways as a sum of consecutive naturals, for example, 11720869 + ... + 11721034.

It is an arithmetic number, because the mean of its divisors is an integer number (492279984).

Almost surely, 2^1945677949 is an apocalyptic number.

It is an amenable number.

1945677949 is a deficient number, since it is larger than the sum of its proper divisors (23441987).

1945677949 is an equidigital number, since it uses as much as digits as its factorization.

1945677949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23441986.

The product of its digits is 17146080, while the sum is 61.

The square root of 1945677949 is about 44109.8395939047. The cubic root of 1945677949 is about 1248.4092723137.

The spelling of 1945677949 in words is "one billion, nine hundred forty-five million, six hundred seventy-seven thousand, nine hundred forty-nine".