61815201 has 16 divisors (see below), whose sum is σ = 94386048. Its totient is φ = 35251200.

The previous prime is 61815161. The next prime is 61815239. The reversal of 61815201 is 10251816.

It is not a de Polignac number, because 61815201 - 2⁷ = 61815073 is a prime.

It is a super-2 number, since 2×61815201² = 7642238149340802, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61815001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8641 + ... + 14081.

It is an arithmetic number, because the mean of its divisors is an integer number (5899128).

Almost surely, 2^61815201 is an apocalyptic number.

It is an amenable number.

61815201 is a deficient number, since it is larger than the sum of its proper divisors (32570847).

61815201 is a wasteful number, since it uses less digits than its factorization.

61815201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5992.

The product of its (nonzero) digits is 480, while the sum is 24.

The square root of 61815201 is about 7862.2643684883. The cubic root of 61815201 is about 395.3955360707.

The spelling of 61815201 in words is "sixty-one million, eight hundred fifteen thousand, two hundred one".