31433578949 has 2 divisors, whose sum is σ = 31433578950. Its totient is φ = 31433578948.

The previous prime is 31433578903. The next prime is 31433578951. The reversal of 31433578949 is 94987533413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25533802849 + 5899776100 = 159793^2 + 76810^2 .

It is a cyclic number.

It is not a de Polignac number, because 31433578949 - 2²⁴ = 31416801733 is a prime.

It is a super-5 number, since 5×31433578949⁵ (a number of 54 digits) contains 55555 as substring.

Together with 31433578951, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 31433578894 and 31433578903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31433578999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15716789474 + 15716789475.

It is an arithmetic number, because the mean of its divisors is an integer number (15716789475).

Almost surely, 2^31433578949 is an apocalyptic number.

It is an amenable number.

31433578949 is a deficient number, since it is larger than the sum of its proper divisors (1).

31433578949 is an equidigital number, since it uses as much as digits as its factorization.

31433578949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9797760, while the sum is 56.

The spelling of 31433578949 in words is "thirty-one billion, four hundred thirty-three million, five hundred seventy-eight thousand, nine hundred forty-nine".