90250031 has 2 divisors, whose sum is σ = 90250032. Its totient is φ = 90250030.

The previous prime is 90250009. The next prime is 90250051. The reversal of 90250031 is 13005209.

It is an a-pointer prime, because the next prime (90250051) can be obtained adding 90250031 to its sum of digits (20).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90250031 - 2¹⁰ = 90249007 is a prime.

It is a super-2 number, since 2×90250031² = 16290136191001922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 90249985 and 90250012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90250051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45125015 + 45125016.

It is an arithmetic number, because the mean of its divisors is an integer number (45125016).

Almost surely, 2^90250031 is an apocalyptic number.

90250031 is a deficient number, since it is larger than the sum of its proper divisors (1).

90250031 is an equidigital number, since it uses as much as digits as its factorization.

90250031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 90250031 is about 9500.0016315788. The cubic root of 90250031 is about 448.5550872813. Note that the first 3 decimals are identical.

The spelling of 90250031 in words is "ninety million, two hundred fifty thousand, thirty-one".