61521354 has 48 divisors (see below), whose sum is σ = 145173600. Its totient is φ = 18754848.

The previous prime is 61521349. The next prime is 61521359. The reversal of 61521354 is 45312516.

It is an interprime number because it is at equal distance from previous prime (61521349) and next prime (61521359).

It is not an unprimeable number, because it can be changed into a prime (61521359) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6817 + ... + 13019.

It is an arithmetic number, because the mean of its divisors is an integer number (3024450).

Almost surely, 2^61521354 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61521354, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72586800).

61521354 is an abundant number, since it is smaller than the sum of its proper divisors (83652246).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61521354 is a wasteful number, since it uses less digits than its factorization.

61521354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6259 (or 6256 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 61521354 is about 7843.5549338294. The cubic root of 61521354 is about 394.7680184611.

The spelling of 61521354 in words is "sixty-one million, five hundred twenty-one thousand, three hundred fifty-four".