1161651 has 8 divisors (see below), whose sum is σ = 1575360. Its totient is φ = 761192.

The previous prime is 1161647. The next prime is 1161659. The reversal of 1161651 is 1561611.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1161651 - 2² = 1161647 is a prime.

It is a super-3 number, since 3×1161651³ = 4702710741263332353, which contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1161659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3105 + ... + 3458.

It is an arithmetic number, because the mean of its divisors is an integer number (196920).

2^1161651 is an apocalyptic number.

1161651 is a deficient number, since it is larger than the sum of its proper divisors (413709).

1161651 is an equidigital number, since it uses as much as digits as its factorization.

1161651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6625.

The product of its digits is 180, while the sum is 21.

The square root of 1161651 is about 1077.7991464090. The cubic root of 1161651 is about 105.1215825178.

It can be divided in two parts, 11616 and 51, that multiplied together give a triangular number (592416 = T₁₀₈₈).

The spelling of 1161651 in words is "one million, one hundred sixty-one thousand, six hundred fifty-one".