551438761 has 2 divisors, whose sum is σ = 551438762. Its totient is φ = 551438760.

The previous prime is 551438687. The next prime is 551438779. The reversal of 551438761 is 167834155.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 289646361 + 261792400 = 17019^2 + 16180^2 .

It is a cyclic number.

It is not a de Polignac number, because 551438761 - 2¹⁵ = 551405993 is a prime.

It is not a weakly prime, because it can be changed into another prime (551433761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275719380 + 275719381.

It is an arithmetic number, because the mean of its divisors is an integer number (275719381).

Almost surely, 2^551438761 is an apocalyptic number.

It is an amenable number.

551438761 is a deficient number, since it is larger than the sum of its proper divisors (1).

551438761 is an equidigital number, since it uses as much as digits as its factorization.

551438761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100800, while the sum is 40.

The square root of 551438761 is about 23482.7332523282. The cubic root of 551438761 is about 820.0350773216.

The spelling of 551438761 in words is "five hundred fifty-one million, four hundred thirty-eight thousand, seven hundred sixty-one".