1945046521 has 4 divisors (see below), whose sum is σ = 2121868944. Its totient is φ = 1768224100.

The previous prime is 1945046507. The next prime is 1945046527. The reversal of 1945046521 is 1256405491.

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 1945046521 - 2⁵ = 1945046489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1945046527) 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, 88411195 + ... + 88411216.

It is an arithmetic number, because the mean of its divisors is an integer number (530467236).

Almost surely, 2^1945046521 is an apocalyptic number.

1945046521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1945046521 is a deficient number, since it is larger than the sum of its proper divisors (176822423).

1945046521 is a wasteful number, since it uses less digits than its factorization.

1945046521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176822422.

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 1945046521 is about 44102.6815624628. The cubic root of 1945046521 is about 1248.2742095611.

The spelling of 1945046521 in words is "one billion, nine hundred forty-five million, forty-six thousand, five hundred twenty-one".