61226815 has 16 divisors (see below), whose sum is σ = 79380000. Its totient is φ = 45067392.

The previous prime is 61226783. The next prime is 61226839. The reversal of 61226815 is 51862216.

It is a cyclic number.

It is not a de Polignac number, because 61226815 - 2⁵ = 61226783 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21336 + ... + 24034.

It is an arithmetic number, because the mean of its divisors is an integer number (4961250).

Almost surely, 2^61226815 is an apocalyptic number.

61226815 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

61226815 is a deficient number, since it is larger than the sum of its proper divisors (18153185).

61226815 is a wasteful number, since it uses less digits than its factorization.

61226815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3066.

The product of its digits is 5760, while the sum is 31.

The square root of 61226815 is about 7824.7565457335. The cubic root of 61226815 is about 394.1370146266.

The spelling of 61226815 in words is "sixty-one million, two hundred twenty-six thousand, eight hundred fifteen".