11401531 has 4 divisors (see below), whose sum is σ = 11409552. Its totient is φ = 11393512.

The previous prime is 11401487. The next prime is 11401549. The reversal of 11401531 is 13510411.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11401531 is a prime.

It is a super-2 number, since 2×11401531² = 259989818287922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11401561) 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, 1240 + ... + 4933.

It is an arithmetic number, because the mean of its divisors is an integer number (2852388).

Almost surely, 2^11401531 is an apocalyptic number.

11401531 is a deficient number, since it is larger than the sum of its proper divisors (8021).

11401531 is an equidigital number, since it uses as much as digits as its factorization.

11401531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8020.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 11401531 is about 3376.6153171482. The cubic root of 11401531 is about 225.0717861477.

Adding to 11401531 its reverse (13510411), we get a palindrome (24911942).

The spelling of 11401531 in words is "eleven million, four hundred one thousand, five hundred thirty-one".