31375477849 has 2 divisors, whose sum is σ = 31375477850. Its totient is φ = 31375477848.

The previous prime is 31375477811. The next prime is 31375477927. The reversal of 31375477849 is 94877457313.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26127489600 + 5247988249 = 161640^2 + 72443^2 .

It is a cyclic number.

It is not a de Polignac number, because 31375477849 - 2¹¹ = 31375475801 is a prime.

It is a super-2 number, since 2×31375477849² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31375477793 and 31375477802.

It is not a weakly prime, because it can be changed into another prime (31375477249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15687738924 + 15687738925.

It is an arithmetic number, because the mean of its divisors is an integer number (15687738925).

Almost surely, 2^31375477849 is an apocalyptic number.

It is an amenable number.

31375477849 is a deficient number, since it is larger than the sum of its proper divisors (1).

31375477849 is an equidigital number, since it uses as much as digits as its factorization.

31375477849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17781120, while the sum is 58.

The spelling of 31375477849 in words is "thirty-one billion, three hundred seventy-five million, four hundred seventy-seven thousand, eight hundred forty-nine".