1043665501 has 2 divisors, whose sum is σ = 1043665502. Its totient is φ = 1043665500.

The previous prime is 1043665487. The next prime is 1043665621. The reversal of 1043665501 is 1055663401.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 990360900 + 53304601 = 31470^2 + 7301^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1043665501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1043605501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 521832750 + 521832751.

It is an arithmetic number, because the mean of its divisors is an integer number (521832751).

Almost surely, 2^1043665501 is an apocalyptic number.

It is an amenable number.

1043665501 is a deficient number, since it is larger than the sum of its proper divisors (1).

1043665501 is an equidigital number, since it uses as much as digits as its factorization.

1043665501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 1043665501 is about 32305.8121860448. The cubic root of 1043665501 is about 1014.3483083984.

The spelling of 1043665501 in words is "one billion, forty-three million, six hundred sixty-five thousand, five hundred one".