149561311 has 4 divisors (see below), whose sum is σ = 149635872. Its totient is φ = 149486752.

The previous prime is 149561309. The next prime is 149561327. The reversal of 149561311 is 113165941.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 149561311 - 2¹ = 149561309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149561351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34186 + ... + 38311.

It is an arithmetic number, because the mean of its divisors is an integer number (37408968).

Almost surely, 2^149561311 is an apocalyptic number.

149561311 is a deficient number, since it is larger than the sum of its proper divisors (74561).

149561311 is an equidigital number, since it uses as much as digits as its factorization.

149561311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74560.

The product of its digits is 3240, while the sum is 31.

The square root of 149561311 is about 12229.5261968729. The cubic root of 149561311 is about 530.8108047870.

The spelling of 149561311 in words is "one hundred forty-nine million, five hundred sixty-one thousand, three hundred eleven".