61676621 has 2 divisors, whose sum is σ = 61676622. Its totient is φ = 61676620.

The previous prime is 61676617. The next prime is 61676623. The reversal of 61676621 is 12667616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38502025 + 23174596 = 6205^2 + 4814^2 .

It is a cyclic number.

It is not a de Polignac number, because 61676621 - 2² = 61676617 is a prime.

Together with 61676623, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_3655592 and since 61676621 and 3655592 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61676623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30838310 + 30838311.

It is an arithmetic number, because the mean of its divisors is an integer number (30838311).

Almost surely, 2^61676621 is an apocalyptic number.

It is an amenable number.

61676621 is a deficient number, since it is larger than the sum of its proper divisors (1).

61676621 is an equidigital number, since it uses as much as digits as its factorization.

61676621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 35.

The square root of 61676621 is about 7853.4464408946. The cubic root of 61676621 is about 395.0998433715.

The spelling of 61676621 in words is "sixty-one million, six hundred seventy-six thousand, six hundred twenty-one".