61131850 has 24 divisors (see below), whose sum is σ = 122453100. Its totient is φ = 22571520.

The previous prime is 61131841. The next prime is 61131857. The reversal of 61131850 is 5813116.

It can be written as a sum of positive squares in 6 ways, for example, as 27573001 + 33558849 = 5251^2 + 5793^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (61131857) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46375 + ... + 47674.

Almost surely, 2^61131850 is an apocalyptic number.

61131850 is an abundant number, since it is smaller than the sum of its proper divisors (61321250).

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

61131850 is a wasteful number, since it uses less digits than its factorization.

61131850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94074 (or 94069 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 61131850 is about 7818.6859509767. The cubic root of 61131850 is about 393.9331356038.

Adding to 61131850 its reverse (5813116), we get a palindrome (66944966).

The spelling of 61131850 in words is "sixty-one million, one hundred thirty-one thousand, eight hundred fifty".