61890031 has 12 divisors (see below), whose sum is σ = 73261552. Its totient is φ = 51214464.

The previous prime is 61890007. The next prime is 61890041. The reversal of 61890031 is 13009816.

It is a happy number.

It is not a de Polignac number, because 61890031 - 2⁵ = 61889999 is a prime.

It is a super-2 number, since 2×61890031² = 7660751874361922, which contains 22 as substring.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61890001) 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 11 ways as a sum of consecutive naturals, for example, 631 + ... + 11143.

Almost surely, 2^61890031 is an apocalyptic number.

61890031 is a deficient number, since it is larger than the sum of its proper divisors (11371521).

61890031 is a wasteful number, since it uses less digits than its factorization.

61890031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10578 (or 10549 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 61890031 is about 7867.0217363371. The cubic root of 61890031 is about 395.5550195880. Note that the first 3 decimals are identical.

Adding to 61890031 its reverse (13009816), we get a palindrome (74899847).

The spelling of 61890031 in words is "sixty-one million, eight hundred ninety thousand, thirty-one".