139201949 has 2 divisors, whose sum is σ = 139201950. Its totient is φ = 139201948.

The previous prime is 139201919. The next prime is 139201981. The reversal of 139201949 is 949102931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107785924 + 31416025 = 10382^2 + 5605^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139201949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139201919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69600974 + 69600975.

It is an arithmetic number, because the mean of its divisors is an integer number (69600975).

Almost surely, 2^139201949 is an apocalyptic number.

It is an amenable number.

139201949 is a deficient number, since it is larger than the sum of its proper divisors (1).

139201949 is an equidigital number, since it uses as much as digits as its factorization.

139201949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 139201949 is about 11798.3875593235. The cubic root of 139201949 is about 518.2608925644.

The spelling of 139201949 in words is "one hundred thirty-nine million, two hundred one thousand, nine hundred forty-nine".