149797621 has 2 divisors, whose sum is σ = 149797622. Its totient is φ = 149797620.

The previous prime is 149797589. The next prime is 149797651. The reversal of 149797621 is 126797941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136188900 + 13608721 = 11670^2 + 3689^2 .

It is an emirp because it is prime and its reverse (126797941) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 149797621 - 2⁵ = 149797589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (149797651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74898810 + 74898811.

It is an arithmetic number, because the mean of its divisors is an integer number (74898811).

Almost surely, 2^149797621 is an apocalyptic number.

It is an amenable number.

149797621 is a deficient number, since it is larger than the sum of its proper divisors (1).

149797621 is an equidigital number, since it uses as much as digits as its factorization.

149797621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 190512, while the sum is 46.

The square root of 149797621 is about 12239.1838371682. The cubic root of 149797621 is about 531.0902217355.

The spelling of 149797621 in words is "one hundred forty-nine million, seven hundred ninety-seven thousand, six hundred twenty-one".