149931797 has 2 divisors, whose sum is σ = 149931798. Its totient is φ = 149931796.

The previous prime is 149931791. The next prime is 149931811. The reversal of 149931797 is 797139941.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115756081 + 34175716 = 10759^2 + 5846^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-149931797 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (149931791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74965898 + 74965899.

It is an arithmetic number, because the mean of its divisors is an integer number (74965899).

Almost surely, 2^149931797 is an apocalyptic number.

It is an amenable number.

149931797 is a deficient number, since it is larger than the sum of its proper divisors (1).

149931797 is an equidigital number, since it uses as much as digits as its factorization.

149931797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 428652, while the sum is 50.

The square root of 149931797 is about 12244.6640215238. The cubic root of 149931797 is about 531.2487429359.

The spelling of 149931797 in words is "one hundred forty-nine million, nine hundred thirty-one thousand, seven hundred ninety-seven".