149639639 has 2 divisors, whose sum is σ = 149639640. Its totient is φ = 149639638.

The previous prime is 149639629. The next prime is 149639647. The reversal of 149639639 is 936936941.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-149639639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (149639629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74819819 + 74819820.

It is an arithmetic number, because the mean of its divisors is an integer number (74819820).

Almost surely, 2^149639639 is an apocalyptic number.

149639639 is a deficient number, since it is larger than the sum of its proper divisors (1).

149639639 is an equidigital number, since it uses as much as digits as its factorization.

149639639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 944784, while the sum is 50.

The square root of 149639639 is about 12232.7281912090. The cubic root of 149639639 is about 530.9034537309.

The spelling of 149639639 in words is "one hundred forty-nine million, six hundred thirty-nine thousand, six hundred thirty-nine".