139271551 has 2 divisors, whose sum is σ = 139271552. Its totient is φ = 139271550.

The previous prime is 139271527. The next prime is 139271557. The reversal of 139271551 is 155172931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 139271551 - 2⁷ = 139271423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139271557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69635775 + 69635776.

It is an arithmetic number, because the mean of its divisors is an integer number (69635776).

Almost surely, 2^139271551 is an apocalyptic number.

139271551 is a deficient number, since it is larger than the sum of its proper divisors (1).

139271551 is an equidigital number, since it uses as much as digits as its factorization.

139271551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9450, while the sum is 34.

The square root of 139271551 is about 11801.3368310544. The cubic root of 139271551 is about 518.3472562599.

The spelling of 139271551 in words is "one hundred thirty-nine million, two hundred seventy-one thousand, five hundred fifty-one".