149983861 has 2 divisors, whose sum is σ = 149983862. Its totient is φ = 149983860.

The previous prime is 149983849. The next prime is 149983927. The reversal of 149983861 is 168389941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134420836 + 15563025 = 11594^2 + 3945^2 .

It is a cyclic number.

It is not a de Polignac number, because 149983861 - 2⁹ = 149983349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (149983831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74991930 + 74991931.

It is an arithmetic number, because the mean of its divisors is an integer number (74991931).

Almost surely, 2^149983861 is an apocalyptic number.

It is an amenable number.

149983861 is a deficient number, since it is larger than the sum of its proper divisors (1).

149983861 is an equidigital number, since it uses as much as digits as its factorization.

149983861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 49.

The square root of 149983861 is about 12246.7898242764. The cubic root of 149983861 is about 531.3102280782.

The spelling of 149983861 in words is "one hundred forty-nine million, nine hundred eighty-three thousand, eight hundred sixty-one".