61214977 has 4 divisors (see below), whose sum is σ = 64815876. Its totient is φ = 57614080.

The previous prime is 61214971. The next prime is 61215023. The reversal of 61214977 is 77941216.

It is a Cunningham number, because it is equal to 7824²+1.

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

It can be written as a sum of positive squares in 2 ways, for example, as 47665216 + 13549761 = 6904^2 + 3681^2 .

It is a cyclic number.

It is not a de Polignac number, because 61214977 - 2⁷ = 61214849 is a prime.

It is a super-2 number, since 2×61214977² = 7494546818221058, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61214971) 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, 1800424 + ... + 1800457.

It is an arithmetic number, because the mean of its divisors is an integer number (16203969).

Almost surely, 2^61214977 is an apocalyptic number.

It is an amenable number.

61214977 is a deficient number, since it is larger than the sum of its proper divisors (3600899).

61214977 is a wasteful number, since it uses less digits than its factorization.

61214977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3600898.

The product of its digits is 21168, while the sum is 37.

The square root of 61214977 is about 7824.0000639059. Note that the first 4 decimals coincide. The cubic root of 61214977 is about 394.1116112979. Note that the first 3 decimals are identical.

The spelling of 61214977 in words is "sixty-one million, two hundred fourteen thousand, nine hundred seventy-seven".