61521434 has 8 divisors (see below), whose sum is σ = 99380820. Its totient is φ = 28394496.

The previous prime is 61521413. The next prime is 61521437. The reversal of 61521434 is 43412516.

It can be written as a sum of positive squares in 2 ways, for example, as 52200625 + 9320809 = 7225^2 + 3053^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (26), and also a Moran number because the ratio is a prime number: 2366209 = 61521434 / (6 + 1 + 5 + 2 + 1 + 4 + 3 + 4).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61521437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1183079 + ... + 1183130.

Almost surely, 2^61521434 is an apocalyptic number.

61521434 is a deficient number, since it is larger than the sum of its proper divisors (37859386).

61521434 is a wasteful number, since it uses less digits than its factorization.

61521434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2366224.

The product of its digits is 2880, while the sum is 26.

The square root of 61521434 is about 7843.5600335562. The cubic root of 61521434 is about 394.7681895748.

The spelling of 61521434 in words is "sixty-one million, five hundred twenty-one thousand, four hundred thirty-four".