61431552 has 216 divisors, whose sum is σ = 218740704. Its totient is φ = 16146432.

The previous prime is 61431529. The next prime is 61431583. The reversal of 61431552 is 25513416.

It is a super-2 number, since 2×61431552² = 7547671162257408, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 209518 + ... + 209810.

Almost surely, 2^61431552 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61431552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109370352).

61431552 is an abundant number, since it is smaller than the sum of its proper divisors (157309152).

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

61431552 is a wasteful number, since it uses less digits than its factorization.

61431552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335 (or 318 counting only the distinct ones).

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

The square root of 61431552 is about 7837.8282706372. The cubic root of 61431552 is about 394.5758455087.

Adding to 61431552 its reverse (25513416), we get a palindrome (86944968).

The spelling of 61431552 in words is "sixty-one million, four hundred thirty-one thousand, five hundred fifty-two".