1157631 has 4 divisors (see below), whose sum is σ = 1543512. Its totient is φ = 771752.

The previous prime is 1157627. The next prime is 1157641. The reversal of 1157631 is 1367511.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1157631 - 2² = 1157627 is a prime.

It is a super-2 number, since 2×1157631² = 2680219064322, which contains 22 as substring.

It is an Ulam number.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1157621) 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, 192936 + ... + 192941.

It is an arithmetic number, because the mean of its divisors is an integer number (385878).

2^1157631 is an apocalyptic number.

1157631 is a deficient number, since it is larger than the sum of its proper divisors (385881).

1157631 is an equidigital number, since it uses as much as digits as its factorization.

1157631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385880.

The product of its digits is 630, while the sum is 24.

The square root of 1157631 is about 1075.9326187081. The cubic root of 1157631 is about 105.0001814056. Note that the first 3 decimals are identical.

The spelling of 1157631 in words is "one million, one hundred fifty-seven thousand, six hundred thirty-one".