61435881 has 32 divisors (see below), whose sum is σ = 98488320. Its totient is φ = 37625472.

The previous prime is 61435879. The next prime is 61435889. The reversal of 61435881 is 18853416.

61435881 is a `hidden beast` number, since 614 + 35 + 8 + 8 + 1 = 666.

It is not a de Polignac number, because 61435881 - 2¹ = 61435879 is a prime.

It is a super-2 number, since 2×61435881² = 7548734948492322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61435889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 134205 + ... + 134661.

It is an arithmetic number, because the mean of its divisors is an integer number (3077760).

Almost surely, 2^61435881 is an apocalyptic number.

It is an amenable number.

61435881 is a deficient number, since it is larger than the sum of its proper divisors (37052439).

61435881 is a wasteful number, since it uses less digits than its factorization.

61435881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862 (or 856 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 61435881 is about 7838.1044264541. The cubic root of 61435881 is about 394.5851137032.

The spelling of 61435881 in words is "sixty-one million, four hundred thirty-five thousand, eight hundred eighty-one".