731315551 has 2 divisors, whose sum is σ = 731315552. Its totient is φ = 731315550.

The previous prime is 731315509. The next prime is 731315569. The reversal of 731315551 is 155513137.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-731315551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (731315951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 365657775 + 365657776.

It is an arithmetic number, because the mean of its divisors is an integer number (365657776).

Almost surely, 2^731315551 is an apocalyptic number.

731315551 is a deficient number, since it is larger than the sum of its proper divisors (1).

731315551 is an equidigital number, since it uses as much as digits as its factorization.

731315551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7875, while the sum is 31.

The square root of 731315551 is about 27042.8465772374. The cubic root of 731315551 is about 900.9518945099.

Adding to 731315551 its reverse (155513137), we get a palindrome (886828688).

The spelling of 731315551 in words is "seven hundred thirty-one million, three hundred fifteen thousand, five hundred fifty-one".