149999639 has 2 divisors, whose sum is σ = 149999640. Its totient is φ = 149999638.

The previous prime is 149999627. The next prime is 149999651. The reversal of 149999639 is 936999941.

It is a balanced prime because it is at equal distance from previous prime (149999627) and next prime (149999651).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-149999639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (149929639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74999819 + 74999820.

It is an arithmetic number, because the mean of its divisors is an integer number (74999820).

Almost surely, 2^149999639 is an apocalyptic number.

149999639 is a deficient number, since it is larger than the sum of its proper divisors (1).

149999639 is an equidigital number, since it uses as much as digits as its factorization.

149999639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4251528, while the sum is 59.

The square root of 149999639 is about 12247.4339761437. The cubic root of 149999639 is about 531.3288583468.

The spelling of 149999639 in words is "one hundred forty-nine million, nine hundred ninety-nine thousand, six hundred thirty-nine".