61521794 has 16 divisors (see below), whose sum is σ = 96827136. Its totient is φ = 29278800.

The previous prime is 61521781. The next prime is 61521799. The reversal of 61521794 is 49712516.

It is a super-2 number, since 2×61521794² = 7569862273956872, which contains 22 as substring.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (61521799) 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, 4352 + ... + 11915.

It is an arithmetic number, because the mean of its divisors is an integer number (6051696).

Almost surely, 2^61521794 is an apocalyptic number.

61521794 is a deficient number, since it is larger than the sum of its proper divisors (35305342).

61521794 is a wasteful number, since it uses less digits than its factorization.

61521794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16361.

The product of its digits is 15120, while the sum is 35.

The square root of 61521794 is about 7843.5829822856. The cubic root of 61521794 is about 394.7689595843.

The spelling of 61521794 in words is "sixty-one million, five hundred twenty-one thousand, seven hundred ninety-four".