61810901 has 2 divisors, whose sum is σ = 61810902. Its totient is φ = 61810900.

The previous prime is 61810891. The next prime is 61810907. The reversal of 61810901 is 10901816.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56175025 + 5635876 = 7495^2 + 2374^2 .

It is a cyclic number.

It is not a de Polignac number, because 61810901 - 2²² = 57616597 is a 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 (61810907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30905450 + 30905451.

It is an arithmetic number, because the mean of its divisors is an integer number (30905451).

Almost surely, 2^61810901 is an apocalyptic number.

It is an amenable number.

61810901 is a deficient number, since it is larger than the sum of its proper divisors (1).

61810901 is an equidigital number, since it uses as much as digits as its factorization.

61810901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 26.

The square root of 61810901 is about 7861.9909056167. The cubic root of 61810901 is about 395.3863676666.

The spelling of 61810901 in words is "sixty-one million, eight hundred ten thousand, nine hundred one".