61521374 has 4 divisors (see below), whose sum is σ = 92282064. Its totient is φ = 30760686.

The previous prime is 61521359. The next prime is 61521379. The reversal of 61521374 is 47312516.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61521379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15380342 + ... + 15380345.

It is an arithmetic number, because the mean of its divisors is an integer number (23070516).

Almost surely, 2^61521374 is an apocalyptic number.

61521374 is a deficient number, since it is larger than the sum of its proper divisors (30760690).

61521374 is a wasteful number, since it uses less digits than its factorization.

61521374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30760689.

The product of its digits is 5040, while the sum is 29.

The square root of 61521374 is about 7843.5562087614. The cubic root of 61521374 is about 394.7680612396.

The spelling of 61521374 in words is "sixty-one million, five hundred twenty-one thousand, three hundred seventy-four".