31229489 has 2 divisors, whose sum is σ = 31229490. Its totient is φ = 31229488.

The previous prime is 31229461. The next prime is 31229509. The reversal of 31229489 is 98492213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21669025 + 9560464 = 4655^2 + 3092^2 .

It is a cyclic number.

It is not a de Polignac number, because 31229489 - 2¹² = 31225393 is a prime.

It is a super-2 number, since 2×31229489² = 1950561966402242, which contains 22 as substring.

It is a Chen prime.

It is equal to p_1929197 and since 31229489 and 1929197 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (31229449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15614744 + 15614745.

It is an arithmetic number, because the mean of its divisors is an integer number (15614745).

Almost surely, 2^31229489 is an apocalyptic number.

It is an amenable number.

31229489 is a deficient number, since it is larger than the sum of its proper divisors (1).

31229489 is an equidigital number, since it uses as much as digits as its factorization.

31229489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 38.

The square root of 31229489 is about 5588.3350830100. The cubic root of 31229489 is about 314.9113347495.

The spelling of 31229489 in words is "thirty-one million, two hundred twenty-nine thousand, four hundred eighty-nine".