1012783621 has 2 divisors, whose sum is σ = 1012783622. Its totient is φ = 1012783620.

The previous prime is 1012783579. The next prime is 1012783627. The reversal of 1012783621 is 1263872101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 966339396 + 46444225 = 31086^2 + 6815^2 .

It is a cyclic number.

It is not a de Polignac number, because 1012783621 - 2⁷ = 1012783493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1012783627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506391810 + 506391811.

It is an arithmetic number, because the mean of its divisors is an integer number (506391811).

Almost surely, 2^1012783621 is an apocalyptic number.

It is an amenable number.

1012783621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1012783621 is an equidigital number, since it uses as much as digits as its factorization.

1012783621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 1012783621 is about 31824.2615153911. The cubic root of 1012783621 is about 1004.2431769836.

The spelling of 1012783621 in words is "one billion, twelve million, seven hundred eighty-three thousand, six hundred twenty-one".