11257661 has 4 divisors (see below), whose sum is σ = 11346432. Its totient is φ = 11168892.

The previous prime is 11257651. The next prime is 11257663. The reversal of 11257661 is 16675211.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16675211 = 7 ⋅2382173.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11257661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11257663) 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, 44195 + ... + 44448.

It is an arithmetic number, because the mean of its divisors is an integer number (2836608).

Almost surely, 2^11257661 is an apocalyptic number.

It is an amenable number.

11257661 is a deficient number, since it is larger than the sum of its proper divisors (88771).

11257661 is an equidigital number, since it uses as much as digits as its factorization.

11257661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88770.

The product of its digits is 2520, while the sum is 29.

The square root of 11257661 is about 3355.2438063425. The cubic root of 11257661 is about 224.1210880710.

The spelling of 11257661 in words is "eleven million, two hundred fifty-seven thousand, six hundred sixty-one".