139226497 has 4 divisors (see below), whose sum is σ = 139257520. Its totient is φ = 139195476.

The previous prime is 139226491. The next prime is 139226513. The reversal of 139226497 is 794622931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139226497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139226491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7347 + ... + 18232.

It is an arithmetic number, because the mean of its divisors is an integer number (34814380).

Almost surely, 2^139226497 is an apocalyptic number.

It is an amenable number.

139226497 is a deficient number, since it is larger than the sum of its proper divisors (31023).

139226497 is an equidigital number, since it uses as much as digits as its factorization.

139226497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31022.

The product of its digits is 163296, while the sum is 43.

The square root of 139226497 is about 11799.4278251108. The cubic root of 139226497 is about 518.2913555493.

It can be divided in two parts, 1392 and 26497, that added together give a square (27889 = 167²).

The spelling of 139226497 in words is "one hundred thirty-nine million, two hundred twenty-six thousand, four hundred ninety-seven".