140238551 has 2 divisors, whose sum is σ = 140238552. Its totient is φ = 140238550.

The previous prime is 140238529. The next prime is 140238599. The reversal of 140238551 is 155832041.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 140238551 - 2¹⁰ = 140237527 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140238851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70119275 + 70119276.

It is an arithmetic number, because the mean of its divisors is an integer number (70119276).

Almost surely, 2^140238551 is an apocalyptic number.

140238551 is a deficient number, since it is larger than the sum of its proper divisors (1).

140238551 is an equidigital number, since it uses as much as digits as its factorization.

140238551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 140238551 is about 11842.2358953029. The cubic root of 140238551 is about 519.5441653720.

The spelling of 140238551 in words is "one hundred forty million, two hundred thirty-eight thousand, five hundred fifty-one".