251053109 has 2 divisors, whose sum is σ = 251053110. Its totient is φ = 251053108.

The previous prime is 251053091. The next prime is 251053111. The reversal of 251053109 is 901350152.

Together with previous prime (251053091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 204404209 + 46648900 = 14297^2 + 6830^2 .

It is a cyclic number.

It is not a de Polignac number, because 251053109 - 2⁸ = 251052853 is a prime.

Together with 251053111, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251053189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125526554 + 125526555.

It is an arithmetic number, because the mean of its divisors is an integer number (125526555).

Almost surely, 2^251053109 is an apocalyptic number.

It is an amenable number.

251053109 is a deficient number, since it is larger than the sum of its proper divisors (1).

251053109 is an equidigital number, since it uses as much as digits as its factorization.

251053109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1350, while the sum is 26.

The square root of 251053109 is about 15844.6555342803. The cubic root of 251053109 is about 630.8438419319.

The spelling of 251053109 in words is "two hundred fifty-one million, fifty-three thousand, one hundred nine".