61501811 has 6 divisors (see below), whose sum is σ = 71542980. Its totient is φ = 52715796.

The previous prime is 61501789. The next prime is 61501819. The reversal of 61501811 is 11810516.

It is a happy number.

It is not a de Polignac number, because 61501811 - 2²² = 57307507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61501819) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 627521 + ... + 627618.

It is an arithmetic number, because the mean of its divisors is an integer number (11923830).

Almost surely, 2^61501811 is an apocalyptic number.

61501811 is a deficient number, since it is larger than the sum of its proper divisors (10041169).

61501811 is a wasteful number, since it uses less digits than its factorization.

61501811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1255153 (or 1255146 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 23.

The square root of 61501811 is about 7842.3090349718. The cubic root of 61501811 is about 394.7262130936.

The spelling of 61501811 in words is "sixty-one million, five hundred one thousand, eight hundred eleven".