149761861 has 2 divisors, whose sum is σ = 149761862. Its totient is φ = 149761860.

The previous prime is 149761853. The next prime is 149761873. The reversal of 149761861 is 168167941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133841761 + 15920100 = 11569^2 + 3990^2 .

It is a cyclic number.

It is not a de Polignac number, because 149761861 - 2³ = 149761853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (149761831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74880930 + 74880931.

It is an arithmetic number, because the mean of its divisors is an integer number (74880931).

Almost surely, 2^149761861 is an apocalyptic number.

It is an amenable number.

149761861 is a deficient number, since it is larger than the sum of its proper divisors (1).

149761861 is an equidigital number, since it uses as much as digits as its factorization.

149761861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 43.

The square root of 149761861 is about 12237.7228682464. The cubic root of 149761861 is about 531.0479573843.

The spelling of 149761861 in words is "one hundred forty-nine million, seven hundred sixty-one thousand, eight hundred sixty-one".