31401869 has 2 divisors, whose sum is σ = 31401870. Its totient is φ = 31401868.

The previous prime is 31401833. The next prime is 31401901. The reversal of 31401869 is 96810413.

It is a happy number.

It is an a-pointer prime, because the next prime (31401901) can be obtained adding 31401869 to its sum of digits (32).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23164969 + 8236900 = 4813^2 + 2870^2 .

It is a cyclic number.

It is not a de Polignac number, because 31401869 - 2²⁰ = 30353293 is a prime.

It is a super-2 number, since 2×31401869² = 1972154753386322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31401829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15700934 + 15700935.

It is an arithmetic number, because the mean of its divisors is an integer number (15700935).

Almost surely, 2^31401869 is an apocalyptic number.

It is an amenable number.

31401869 is a deficient number, since it is larger than the sum of its proper divisors (1).

31401869 is an equidigital number, since it uses as much as digits as its factorization.

31401869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 31401869 is about 5603.7370566435. The cubic root of 31401869 is about 315.4896859957.

The spelling of 31401869 in words is "thirty-one million, four hundred one thousand, eight hundred sixty-nine".