1040171621 has 4 divisors (see below), whose sum is σ = 1044038700. Its totient is φ = 1036304544.

The previous prime is 1040171579. The next prime is 1040171641. The reversal of 1040171621 is 1261710401.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 129640996 + 910530625 = 11386^2 + 30175^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1040171621 is a prime.

It is a super-2 number, since 2×1040171621² = 2163914002267535282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1040171641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1933136 + ... + 1933673.

It is an arithmetic number, because the mean of its divisors is an integer number (261009675).

Almost surely, 2^1040171621 is an apocalyptic number.

It is an amenable number.

1040171621 is a deficient number, since it is larger than the sum of its proper divisors (3867079).

1040171621 is an equidigital number, since it uses as much as digits as its factorization.

1040171621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3867078.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 1040171621 is about 32251.6917540770. The cubic root of 1040171621 is about 1013.2151313415.

The spelling of 1040171621 in words is "one billion, forty million, one hundred seventy-one thousand, six hundred twenty-one".