149988997 has 2 divisors, whose sum is σ = 149988998. Its totient is φ = 149988996.

The previous prime is 149988989. The next prime is 149989013. The reversal of 149988997 is 799889941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139452481 + 10536516 = 11809^2 + 3246^2 .

It is an emirp because it is prime and its reverse (799889941) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 149988997 - 2³ = 149988989 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 (149988967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74994498 + 74994499.

It is an arithmetic number, because the mean of its divisors is an integer number (74994499).

Almost surely, 2^149988997 is an apocalyptic number.

It is an amenable number.

149988997 is a deficient number, since it is larger than the sum of its proper divisors (1).

149988997 is an equidigital number, since it uses as much as digits as its factorization.

149988997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11757312, while the sum is 64.

The square root of 149988997 is about 12246.9995100841. Note that the first 3 decimals coincide. The cubic root of 149988997 is about 531.3162926823.

The spelling of 149988997 in words is "one hundred forty-nine million, nine hundred eighty-eight thousand, nine hundred ninety-seven".