61401516 has 24 divisors (see below), whose sum is σ = 156295104. Its totient is φ = 18606480.

The previous prime is 61401511. The next prime is 61401533. The reversal of 61401516 is 61510416.

It is not an unprimeable number, because it can be changed into a prime (61401511) 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, 232450 + ... + 232713.

It is an arithmetic number, because the mean of its divisors is an integer number (6512296).

Almost surely, 2^61401516 is an apocalyptic number.

61401516 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

61401516 is an abundant number, since it is smaller than the sum of its proper divisors (94893588).

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

61401516 is a wasteful number, since it uses less digits than its factorization.

61401516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465181 (or 465179 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 61401516 is about 7835.9119443751. The cubic root of 61401516 is about 394.5115277883.

Subtracting 61401516 from its reverse (61510416), we obtain a square (108900 = 330²).

The spelling of 61401516 in words is "sixty-one million, four hundred one thousand, five hundred sixteen".