1951044421 has 2 divisors, whose sum is σ = 1951044422. Its totient is φ = 1951044420.

The previous prime is 1951044419. The next prime is 1951044481. The reversal of 1951044421 is 1244401591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1677803521 + 273240900 = 40961^2 + 16530^2 .

It is a cyclic number.

It is not a de Polignac number, because 1951044421 - 2¹ = 1951044419 is a prime.

Together with 1951044419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1951044481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 975522210 + 975522211.

It is an arithmetic number, because the mean of its divisors is an integer number (975522211).

Almost surely, 2^1951044421 is an apocalyptic number.

It is an amenable number.

1951044421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1951044421 is an equidigital number, since it uses as much as digits as its factorization.

1951044421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 1951044421 is about 44170.6284877179. The cubic root of 1951044421 is about 1249.5559854462. Note that the first 3 decimals are identical.

The spelling of 1951044421 in words is "one billion, nine hundred fifty-one million, forty-four thousand, four hundred twenty-one".