61815701 has 2 divisors, whose sum is σ = 61815702. Its totient is φ = 61815700.

The previous prime is 61815671. The next prime is 61815703. The reversal of 61815701 is 10751816.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60435076 + 1380625 = 7774^2 + 1175^2 .

It is a cyclic number.

It is not a de Polignac number, because 61815701 - 2¹⁰ = 61814677 is a prime.

Together with 61815703, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61815703) 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, 30907850 + 30907851.

It is an arithmetic number, because the mean of its divisors is an integer number (30907851).

Almost surely, 2^61815701 is an apocalyptic number.

It is an amenable number.

61815701 is a deficient number, since it is larger than the sum of its proper divisors (1).

61815701 is an equidigital number, since it uses as much as digits as its factorization.

61815701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 29.

The square root of 61815701 is about 7862.2961658793. The cubic root of 61815701 is about 395.3966021366.

The spelling of 61815701 in words is "sixty-one million, eight hundred fifteen thousand, seven hundred one".