651611601031 has 4 divisors (see below), whose sum is σ = 651849331464. Its totient is φ = 651373870600.

The previous prime is 651611601013. The next prime is 651611601049. The reversal of 651611601031 is 130106116156.

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

It is an interprime number because it is at equal distance from previous prime (651611601013) and next prime (651611601049).

It is a cyclic number.

It is not a de Polignac number, because 651611601031 - 2¹¹ = 651611598983 is a prime.

It is a super-2 number, since 2×651611601031² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 651611600984 and 651611601002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651611601001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118861105 + ... + 118866586.

It is an arithmetic number, because the mean of its divisors is an integer number (162962332866).

Almost surely, 2^651611601031 is an apocalyptic number.

651611601031 is a deficient number, since it is larger than the sum of its proper divisors (237730433).

651611601031 is a wasteful number, since it uses less digits than its factorization.

651611601031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237730432.

The product of its (nonzero) digits is 3240, while the sum is 31.

Adding to 651611601031 its reverse (130106116156), we get a palindrome (781717717187).

The spelling of 651611601031 in words is "six hundred fifty-one billion, six hundred eleven million, six hundred one thousand, thirty-one".