1157021 has 4 divisors (see below), whose sum is σ = 1159200. Its totient is φ = 1154844.

The previous prime is 1157017. The next prime is 1157033. The reversal of 1157021 is 1207511.

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 1157021 - 2² = 1157017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1157011) 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, 290 + ... + 1548.

It is an arithmetic number, because the mean of its divisors is an integer number (289800).

2^1157021 is an apocalyptic number.

It is an amenable number.

1157021 is a deficient number, since it is larger than the sum of its proper divisors (2179).

1157021 is an equidigital number, since it uses as much as digits as its factorization.

1157021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2178.

The product of its (nonzero) digits is 70, while the sum is 17.

The square root of 1157021 is about 1075.6491063539. The cubic root of 1157021 is about 104.9817352962.

The spelling of 1157021 in words is "one million, one hundred fifty-seven thousand, twenty-one".