149215639 has 2 divisors, whose sum is σ = 149215640. Its totient is φ = 149215638.

The previous prime is 149215637. The next prime is 149215667. The reversal of 149215639 is 936512941.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 149215639 - 2¹ = 149215637 is a prime.

Together with 149215637, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (149215637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74607819 + 74607820.

It is an arithmetic number, because the mean of its divisors is an integer number (74607820).

Almost surely, 2^149215639 is an apocalyptic number.

149215639 is a deficient number, since it is larger than the sum of its proper divisors (1).

149215639 is an equidigital number, since it uses as much as digits as its factorization.

149215639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 40.

The square root of 149215639 is about 12215.3853398082. The cubic root of 149215639 is about 530.4015457047.

The spelling of 149215639 in words is "one hundred forty-nine million, two hundred fifteen thousand, six hundred thirty-nine".