61351540 has 24 divisors (see below), whose sum is σ = 131836320. Its totient is φ = 23969568.

The previous prime is 61351531. The next prime is 61351547. The reversal of 61351540 is 4515316.

It is a super-2 number, since 2×61351540² = 7528022920743200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61351547) 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, 34810 + ... + 36529.

It is an arithmetic number, because the mean of its divisors is an integer number (5493180).

Almost surely, 2^61351540 is an apocalyptic number.

It is an amenable number.

61351540 is an abundant number, since it is smaller than the sum of its proper divisors (70484780).

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

61351540 is a wasteful number, since it uses less digits than its factorization.

61351540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71391 (or 71389 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 61351540 is about 7832.7223875227. The cubic root of 61351540 is about 394.4044649613.

Adding to 61351540 its reverse (4515316), we get a palindrome (65866856).

The spelling of 61351540 in words is "sixty-one million, three hundred fifty-one thousand, five hundred forty".