1954521243 has 6 divisors (see below), whose sum is σ = 2823197364. Its totient is φ = 1303014156.

The previous prime is 1954521221. The next prime is 1954521251. The reversal of 1954521243 is 3421254591.

1954521243 is a `hidden beast` number, since 1 + 95 + 4 + 521 + 2 + 43 = 666.

It is not a de Polignac number, because 1954521243 - 2⁵ = 1954521211 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1954521198 and 1954521207.

It is not an unprimeable number, because it can be changed into a prime (1954521043) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 108584505 + ... + 108584522.

It is an arithmetic number, because the mean of its divisors is an integer number (470532894).

Almost surely, 2^1954521243 is an apocalyptic number.

1954521243 is a deficient number, since it is larger than the sum of its proper divisors (868676121).

1954521243 is a wasteful number, since it uses less digits than its factorization.

1954521243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217169033 (or 217169030 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 1954521243 is about 44209.9676882940. The cubic root of 1954521243 is about 1250.2977942226.

The spelling of 1954521243 in words is "one billion, nine hundred fifty-four million, five hundred twenty-one thousand, two hundred forty-three".