1157641 has 2 divisors, whose sum is σ = 1157642. Its totient is φ = 1157640.

The previous prime is 1157627. The next prime is 1157669. The reversal of 1157641 is 1467511.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 646416 + 511225 = 804^2 + 715^2 .

It is an emirp because it is prime and its reverse (1467511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1157641 - 2⁵ = 1157609 is a prime.

1157641 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1157621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 578820 + 578821.

It is an arithmetic number, because the mean of its divisors is an integer number (578821).

2^1157641 is an apocalyptic number.

It is an amenable number.

1157641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1157641 is an equidigital number, since it uses as much as digits as its factorization.

1157641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 840, while the sum is 25.

The square root of 1157641 is about 1075.9372658292. The cubic root of 1157641 is about 105.0004837468. Note that the first 3 decimals are identical.

The spelling of 1157641 in words is "one million, one hundred fifty-seven thousand, six hundred forty-one".