1018774621 has 2 divisors, whose sum is σ = 1018774622. Its totient is φ = 1018774620.

The previous prime is 1018774573. The next prime is 1018774637. The reversal of 1018774621 is 1264778101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 991620100 + 27154521 = 31490^2 + 5211^2 .

It is a cyclic number.

It is not a de Polignac number, because 1018774621 - 2²⁵ = 985220189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1018774681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 509387310 + 509387311.

It is an arithmetic number, because the mean of its divisors is an integer number (509387311).

Almost surely, 2^1018774621 is an apocalyptic number.

It is an amenable number.

1018774621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1018774621 is an equidigital number, since it uses as much as digits as its factorization.

1018774621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18816, while the sum is 37.

The square root of 1018774621 is about 31918.2490277897. The cubic root of 1018774621 is about 1006.2194453076.

The spelling of 1018774621 in words is "one billion, eighteen million, seven hundred seventy-four thousand, six hundred twenty-one".