61977321 has 24 divisors (see below), whose sum is σ = 105842880. Its totient is φ = 34193376.

The previous prime is 61977287. The next prime is 61977347. The reversal of 61977321 is 12377916.

It is a happy number.

61977321 is a `hidden beast` number, since 619 + 7 + 7 + 32 + 1 = 666.

It is not a de Polignac number, because 61977321 - 2¹⁷ = 61846249 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61977361) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15135 + ... + 18788.

It is an arithmetic number, because the mean of its divisors is an integer number (4410120).

Almost surely, 2^61977321 is an apocalyptic number.

It is an amenable number.

61977321 is a deficient number, since it is larger than the sum of its proper divisors (43865559).

61977321 is a wasteful number, since it uses less digits than its factorization.

61977321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33965 (or 33962 counting only the distinct ones).

The product of its digits is 15876, while the sum is 36.

The square root of 61977321 is about 7872.5676243523. The cubic root of 61977321 is about 395.7408964677.

The spelling of 61977321 in words is "sixty-one million, nine hundred seventy-seven thousand, three hundred twenty-one".