61818501 has 8 divisors (see below), whose sum is σ = 83195424. Its totient is φ = 40826960.

The previous prime is 61818469. The next prime is 61818509. The reversal of 61818501 is 10581816.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61818501 - 2⁵ = 61818469 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61818509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95970 + ... + 96611.

It is an arithmetic number, because the mean of its divisors is an integer number (10399428).

Almost surely, 2^61818501 is an apocalyptic number.

It is an amenable number.

61818501 is a deficient number, since it is larger than the sum of its proper divisors (21376923).

61818501 is a wasteful number, since it uses less digits than its factorization.

61818501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192691.

The product of its (nonzero) digits is 1920, while the sum is 30.

The square root of 61818501 is about 7862.4742288926. The cubic root of 61818501 is about 395.4025719995.

The spelling of 61818501 in words is "sixty-one million, eight hundred eighteen thousand, five hundred one".