61321031 has 4 divisors (see below), whose sum is σ = 61611864. Its totient is φ = 61030200.

The previous prime is 61321021. The next prime is 61321049. The reversal of 61321031 is 13012316.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61321031 - 2¹⁸ = 61058887 is a prime.

It is a super-2 number, since 2×61321031² = 7520537685805922, 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 (61321021) 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 3 ways as a sum of consecutive naturals, for example, 145100 + ... + 145521.

It is an arithmetic number, because the mean of its divisors is an integer number (15402966).

Almost surely, 2^61321031 is an apocalyptic number.

61321031 is a deficient number, since it is larger than the sum of its proper divisors (290833).

61321031 is a wasteful number, since it uses less digits than its factorization.

61321031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290832.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 61321031 is about 7830.7746104712. The cubic root of 61321031 is about 394.3390774098.

Adding to 61321031 its reverse (13012316), we get a palindrome (74333347).

The spelling of 61321031 in words is "sixty-one million, three hundred twenty-one thousand, thirty-one".