61309977 has 4 divisors (see below), whose sum is σ = 81746640. Its totient is φ = 40873316.

The previous prime is 61309967. The next prime is 61309987. The reversal of 61309977 is 77990316.

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 an interprime number because it is at equal distance from previous prime (61309967) and next prime (61309987).

It is a cyclic number.

It is not a de Polignac number, because 61309977 - 2¹⁹ = 60785689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61309967) 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, 10218327 + ... + 10218332.

It is an arithmetic number, because the mean of its divisors is an integer number (20436660).

Almost surely, 2^61309977 is an apocalyptic number.

It is an amenable number.

61309977 is a deficient number, since it is larger than the sum of its proper divisors (20436663).

61309977 is a wasteful number, since it uses less digits than its factorization.

61309977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20436662.

The product of its (nonzero) digits is 71442, while the sum is 42.

The square root of 61309977 is about 7830.0687736443. The cubic root of 61309977 is about 394.3153808843.

The spelling of 61309977 in words is "sixty-one million, three hundred nine thousand, nine hundred seventy-seven".