61869811 has 2 divisors, whose sum is σ = 61869812. Its totient is φ = 61869810.

The previous prime is 61869803. The next prime is 61869827. The reversal of 61869811 is 11896816.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61869811 - 2³ = 61869803 is a prime.

It is not a weakly prime, because it can be changed into another prime (61866811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30934905 + 30934906.

It is an arithmetic number, because the mean of its divisors is an integer number (30934906).

Almost surely, 2^61869811 is an apocalyptic number.

61869811 is a deficient number, since it is larger than the sum of its proper divisors (1).

61869811 is an equidigital number, since it uses as much as digits as its factorization.

61869811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 40.

The square root of 61869811 is about 7865.7365198689. The cubic root of 61869811 is about 395.5119378318.

The spelling of 61869811 in words is "sixty-one million, eight hundred sixty-nine thousand, eight hundred eleven".