149817631 has 2 divisors, whose sum is σ = 149817632. Its totient is φ = 149817630.

The previous prime is 149817587. The next prime is 149817659. The reversal of 149817631 is 136718941.

149817631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (136718941) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 149817631 - 2¹⁹ = 149293343 is a prime.

It is a super-2 number, since 2×149817631² = 44890645116904322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (149817671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74908815 + 74908816.

It is an arithmetic number, because the mean of its divisors is an integer number (74908816).

Almost surely, 2^149817631 is an apocalyptic number.

149817631 is a deficient number, since it is larger than the sum of its proper divisors (1).

149817631 is an equidigital number, since it uses as much as digits as its factorization.

149817631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 40.

The square root of 149817631 is about 12240.0012663398. The cubic root of 149817631 is about 531.1138683998.

The spelling of 149817631 in words is "one hundred forty-nine million, eight hundred seventeen thousand, six hundred thirty-one".