61861031 has 8 divisors (see below), whose sum is σ = 64087200. Its totient is φ = 59641120.

The previous prime is 61861013. The next prime is 61861043. The reversal of 61861031 is 13016816.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61861031 - 2¹⁴ = 61844647 is a prime.

It is a super-2 number, since 2×61861031² = 7653574312765922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61861001) 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, 28865 + ... + 30933.

It is an arithmetic number, because the mean of its divisors is an integer number (8010900).

Almost surely, 2^61861031 is an apocalyptic number.

61861031 is a deficient number, since it is larger than the sum of its proper divisors (2226169).

61861031 is a wasteful number, since it uses less digits than its factorization.

61861031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3129.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 61861031 is about 7865.1783832282. The cubic root of 61861031 is about 395.4932277962.

Adding to 61861031 its reverse (13016816), we get a palindrome (74877847).

The spelling of 61861031 in words is "sixty-one million, eight hundred sixty-one thousand, thirty-one".