61550001 has 24 divisors (see below), whose sum is σ = 93125760. Its totient is φ = 39099456.

The previous prime is 61549967. The next prime is 61550033. The reversal of 61550001 is 10005516.

61550001 is a `hidden beast` number, since 615 + 50 + 0 + 0 + 1 = 666.

It is not a de Polignac number, because 61550001 - 2⁹ = 61549489 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61550201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 84300 + ... + 85026.

It is an arithmetic number, because the mean of its divisors is an integer number (3880240).

Almost surely, 2^61550001 is an apocalyptic number.

It is an amenable number.

61550001 is a deficient number, since it is larger than the sum of its proper divisors (31575759).

61550001 is a wasteful number, since it uses less digits than its factorization.

61550001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1165 (or 1162 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 61550001 is about 7845.3808702956. The cubic root of 61550001 is about 394.8292826338.

Adding to 61550001 its reverse (10005516), we get a palindrome (71555517).

The spelling of 61550001 in words is "sixty-one million, five hundred fifty thousand, one".