28373131 has 2 divisors, whose sum is σ = 28373132. Its totient is φ = 28373130.

The previous prime is 28373089. The next prime is 28373141. The reversal of 28373131 is 13137382.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28373131 - 2⁷ = 28373003 is a prime.

It is a super-2 number, since 2×28373131² = 1610069125486322, 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 28373131.

It is not a weakly prime, because it can be changed into another prime (28373141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14186565 + 14186566.

It is an arithmetic number, because the mean of its divisors is an integer number (14186566).

Almost surely, 2^28373131 is an apocalyptic number.

28373131 is a deficient number, since it is larger than the sum of its proper divisors (1).

28373131 is an equidigital number, since it uses as much as digits as its factorization.

28373131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 28.

The square root of 28373131 is about 5326.6435022442. The cubic root of 28373131 is about 305.0018131219.

The spelling of 28373131 in words is "twenty-eight million, three hundred seventy-three thousand, one hundred thirty-one".