28051031 has 2 divisors, whose sum is σ = 28051032. Its totient is φ = 28051030.

The previous prime is 28050991. The next prime is 28051061. The reversal of 28051031 is 13015082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28051031 - 2¹⁰ = 28050007 is a prime.

It is a super-2 number, since 2×28051031² = 1573720680325922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28050994 and 28051012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28051061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14025515 + 14025516.

It is an arithmetic number, because the mean of its divisors is an integer number (14025516).

Almost surely, 2^28051031 is an apocalyptic number.

28051031 is a deficient number, since it is larger than the sum of its proper divisors (1).

28051031 is an equidigital number, since it uses as much as digits as its factorization.

28051031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 28051031 is about 5296.3224033286. The cubic root of 28051031 is about 303.8432616243.

The spelling of 28051031 in words is "twenty-eight million, fifty-one thousand, thirty-one".