31201969 has 2 divisors, whose sum is σ = 31201970. Its totient is φ = 31201968.

The previous prime is 31201939. The next prime is 31201979. The reversal of 31201969 is 96910213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30913600 + 288369 = 5560^2 + 537^2 .

It is a cyclic number.

It is not a de Polignac number, because 31201969 - 2¹³ = 31193777 is a prime.

It is a super-2 number, since 2×31201969² = 1947125738953922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31201969.

It is not a weakly prime, because it can be changed into another prime (31201909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15600984 + 15600985.

It is an arithmetic number, because the mean of its divisors is an integer number (15600985).

Almost surely, 2^31201969 is an apocalyptic number.

It is an amenable number.

31201969 is a deficient number, since it is larger than the sum of its proper divisors (1).

31201969 is an equidigital number, since it uses as much as digits as its factorization.

31201969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 31201969 is about 5585.8722685002. The cubic root of 31201969 is about 314.8188056783.

The spelling of 31201969 in words is "thirty-one million, two hundred one thousand, nine hundred sixty-nine".