61411661 has 2 divisors, whose sum is σ = 61411662. Its totient is φ = 61411660.

The previous prime is 61411631. The next prime is 61411681. The reversal of 61411661 is 16611416.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60762025 + 649636 = 7795^2 + 806^2 .

It is a cyclic number.

It is not a de Polignac number, because 61411661 - 2¹⁰ = 61410637 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61411661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61411631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30705830 + 30705831.

It is an arithmetic number, because the mean of its divisors is an integer number (30705831).

Almost surely, 2^61411661 is an apocalyptic number.

It is an amenable number.

61411661 is a deficient number, since it is larger than the sum of its proper divisors (1).

61411661 is an equidigital number, since it uses as much as digits as its factorization.

61411661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 26.

The square root of 61411661 is about 7836.5592577355. The cubic root of 61411661 is about 394.5332541739.

It can be divided in two parts, 6141 and 1661, that multiplied together give a palindrome (10200201).

The spelling of 61411661 in words is "sixty-one million, four hundred eleven thousand, six hundred sixty-one".