61700921 has 2 divisors, whose sum is σ = 61700922. Its totient is φ = 61700920.

The previous prime is 61700911. The next prime is 61700981. The reversal of 61700921 is 12900716.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53860921 + 7840000 = 7339^2 + 2800^2 .

It is a cyclic number.

It is not a de Polignac number, because 61700921 - 2⁶ = 61700857 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61700911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30850460 + 30850461.

It is an arithmetic number, because the mean of its divisors is an integer number (30850461).

Almost surely, 2^61700921 is an apocalyptic number.

It is an amenable number.

61700921 is a deficient number, since it is larger than the sum of its proper divisors (1).

61700921 is an equidigital number, since it uses as much as digits as its factorization.

61700921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 61700921 is about 7854.9933800099. The cubic root of 61700921 is about 395.1517250808.

The spelling of 61700921 in words is "sixty-one million, seven hundred thousand, nine hundred twenty-one".