139242451 has 2 divisors, whose sum is σ = 139242452. Its totient is φ = 139242450.

The previous prime is 139242449. The next prime is 139242473. The reversal of 139242451 is 154242931.

139242451 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139242451 - 2¹ = 139242449 is a prime.

Together with 139242449, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (139242401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69621225 + 69621226.

It is an arithmetic number, because the mean of its divisors is an integer number (69621226).

Almost surely, 2^139242451 is an apocalyptic number.

139242451 is a deficient number, since it is larger than the sum of its proper divisors (1).

139242451 is an equidigital number, since it uses as much as digits as its factorization.

139242451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 31.

The square root of 139242451 is about 11800.1038554752. The cubic root of 139242451 is about 518.3111518396.

The spelling of 139242451 in words is "one hundred thirty-nine million, two hundred forty-two thousand, four hundred fifty-one".