1157621 has 2 divisors, whose sum is σ = 1157622. Its totient is φ = 1157620.

The previous prime is 1157609. The next prime is 1157627. The reversal of 1157621 is 1267511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1060900 + 96721 = 1030^2 + 311^2 .

It is a cyclic number.

It is not a de Polignac number, because 1157621 - 2⁶ = 1157557 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1157627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 578810 + 578811.

It is an arithmetic number, because the mean of its divisors is an integer number (578811).

2^1157621 is an apocalyptic number.

It is an amenable number.

1157621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1157621 is an equidigital number, since it uses as much as digits as its factorization.

1157621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 420, while the sum is 23.

The square root of 1157621 is about 1075.9279715669. The cubic root of 1157621 is about 104.9998790626. Note that the first 3 decimals are identical.

The spelling of 1157621 in words is "one million, one hundred fifty-seven thousand, six hundred twenty-one".