1051409661 has 4 divisors (see below), whose sum is σ = 1401879552. Its totient is φ = 700939772.

The previous prime is 1051409629. The next prime is 1051409687. The reversal of 1051409661 is 1669041501.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1051409661 - 2⁵ = 1051409629 is a prime.

It is a super-2 number, since 2×1051409661² = 2210924550488269842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1051409461) 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, 175234941 + ... + 175234946.

It is an arithmetic number, because the mean of its divisors is an integer number (350469888).

Almost surely, 2^1051409661 is an apocalyptic number.

It is an amenable number.

1051409661 is a deficient number, since it is larger than the sum of its proper divisors (350469891).

1051409661 is an equidigital number, since it uses as much as digits as its factorization.

1051409661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350469890.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 1051409661 is about 32425.4477378494. The cubic root of 1051409661 is about 1016.8510024020.

The spelling of 1051409661 in words is "one billion, fifty-one million, four hundred nine thousand, six hundred sixty-one".