61154871 has 4 divisors (see below), whose sum is σ = 81539832. Its totient is φ = 40769912.

The previous prime is 61154869. The next prime is 61154897. The reversal of 61154871 is 17845116.

It is a happy number.

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 61154871 - 2¹ = 61154869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61154771) 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, 10192476 + ... + 10192481.

It is an arithmetic number, because the mean of its divisors is an integer number (20384958).

Almost surely, 2^61154871 is an apocalyptic number.

61154871 is a deficient number, since it is larger than the sum of its proper divisors (20384961).

61154871 is a wasteful number, since it uses less digits than its factorization.

61154871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20384960.

The product of its digits is 6720, while the sum is 33.

The square root of 61154871 is about 7820.1579907314. The cubic root of 61154871 is about 393.9825784424.

Adding to 61154871 its reverse (17845116), we get a palindrome (78999987).

The spelling of 61154871 in words is "sixty-one million, one hundred fifty-four thousand, eight hundred seventy-one".