139172797 has 2 divisors, whose sum is σ = 139172798. Its totient is φ = 139172796.

The previous prime is 139172779. The next prime is 139172843. The reversal of 139172797 is 797271931.

Together with previous prime (139172779) it forms an Ormiston pair, because they use the same digits, order apart.

It is an a-pointer prime, because the next prime (139172843) can be obtained adding 139172797 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101485476 + 37687321 = 10074^2 + 6139^2 .

It is a cyclic number.

It is not a de Polignac number, because 139172797 - 2²³ = 130784189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139172767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69586398 + 69586399.

It is an arithmetic number, because the mean of its divisors is an integer number (69586399).

Almost surely, 2^139172797 is an apocalyptic number.

It is an amenable number.

139172797 is a deficient number, since it is larger than the sum of its proper divisors (1).

139172797 is an equidigital number, since it uses as much as digits as its factorization.

139172797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 166698, while the sum is 46.

The square root of 139172797 is about 11797.1520715807. The cubic root of 139172797 is about 518.2247115663.

The spelling of 139172797 in words is "one hundred thirty-nine million, one hundred seventy-two thousand, seven hundred ninety-seven".