11531939 has 2 divisors, whose sum is σ = 11531940. Its totient is φ = 11531938.

The previous prime is 11531921. The next prime is 11531951. The reversal of 11531939 is 93913511.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11531939 - 2⁸ = 11531683 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11531909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5765969 + 5765970.

It is an arithmetic number, because the mean of its divisors is an integer number (5765970).

Almost surely, 2^11531939 is an apocalyptic number.

11531939 is a deficient number, since it is larger than the sum of its proper divisors (1).

11531939 is an equidigital number, since it uses as much as digits as its factorization.

11531939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3645, while the sum is 32.

The square root of 11531939 is about 3395.8708750481. The cubic root of 11531939 is about 225.9266410298.

The spelling of 11531939 in words is "eleven million, five hundred thirty-one thousand, nine hundred thirty-nine".