61311149 has 4 divisors (see below), whose sum is σ = 63288960. Its totient is φ = 59333340.

The previous prime is 61311143. The next prime is 61311193. The reversal of 61311149 is 94111316.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61311149 - 2²⁴ = 44533933 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 (61311143) 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, 988859 + ... + 988920.

It is an arithmetic number, because the mean of its divisors is an integer number (15822240).

Almost surely, 2^61311149 is an apocalyptic number.

It is an amenable number.

61311149 is a deficient number, since it is larger than the sum of its proper divisors (1977811).

61311149 is a wasteful number, since it uses less digits than its factorization.

61311149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1977810.

The product of its digits is 648, while the sum is 26.

The square root of 61311149 is about 7830.1436129869. The cubic root of 61311149 is about 394.3178934427.

The spelling of 61311149 in words is "sixty-one million, three hundred eleven thousand, one hundred forty-nine".