1011631 has 2 divisors, whose sum is σ = 1011632. Its totient is φ = 1011630.

The previous prime is 1011601. The next prime is 1011641. The reversal of 1011631 is 1361101.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1011631 - 2⁵ = 1011599 is a prime.

It is a super-2 number, since 2×1011631² = 2046794560322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1011601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505815 + 505816.

It is an arithmetic number, because the mean of its divisors is an integer number (505816).

2^1011631 is an apocalyptic number.

1011631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011631 is an equidigital number, since it uses as much as digits as its factorization.

1011631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 1011631 is about 1005.7986876110. The cubic root of 1011631 is about 100.3862065250.

Adding to 1011631 its reverse (1361101), we get a palindrome (2372732).

The spelling of 1011631 in words is "one million, eleven thousand, six hundred thirty-one".