61311023 has 4 divisors (see below), whose sum is σ = 61471488. Its totient is φ = 61150560.

The previous prime is 61310987. The next prime is 61311037. The reversal of 61311023 is 32011316.

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 61311023 - 2²⁴ = 44533807 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61310992 and 61311010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61311073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79658 + ... + 80423.

It is an arithmetic number, because the mean of its divisors is an integer number (15367872).

Almost surely, 2^61311023 is an apocalyptic number.

61311023 is a deficient number, since it is larger than the sum of its proper divisors (160465).

61311023 is a wasteful number, since it uses less digits than its factorization.

61311023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160464.

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

The square root of 61311023 is about 7830.1355671534. The cubic root of 61311023 is about 394.3176233227.

Adding to 61311023 its reverse (32011316), we get a palindrome (93322339).

The spelling of 61311023 in words is "sixty-one million, three hundred eleven thousand, twenty-three".