61810501 has 2 divisors, whose sum is σ = 61810502. Its totient is φ = 61810500.

The previous prime is 61810481. The next prime is 61810531. The reversal of 61810501 is 10501816.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60372900 + 1437601 = 7770^2 + 1199^2 .

It is a cyclic number.

It is not a de Polignac number, because 61810501 - 2¹⁹ = 61286213 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61810531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30905250 + 30905251.

It is an arithmetic number, because the mean of its divisors is an integer number (30905251).

Almost surely, 2^61810501 is an apocalyptic number.

It is an amenable number.

61810501 is a deficient number, since it is larger than the sum of its proper divisors (1).

61810501 is an equidigital number, since it uses as much as digits as its factorization.

61810501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 22.

The square root of 61810501 is about 7861.9654667265. The cubic root of 61810501 is about 395.3855147702.

The spelling of 61810501 in words is "sixty-one million, eight hundred ten thousand, five hundred one".