525561551 has 2 divisors, whose sum is σ = 525561552. Its totient is φ = 525561550.

The previous prime is 525561541. The next prime is 525561583. The reversal of 525561551 is 155165525.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-525561551 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (525561541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 262780775 + 262780776.

It is an arithmetic number, because the mean of its divisors is an integer number (262780776).

Almost surely, 2^525561551 is an apocalyptic number.

525561551 is a deficient number, since it is larger than the sum of its proper divisors (1).

525561551 is an equidigital number, since it uses as much as digits as its factorization.

525561551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37500, while the sum is 35.

The square root of 525561551 is about 22925.1292471820. The cubic root of 525561551 is about 807.0018467037.

The spelling of 525561551 in words is "five hundred twenty-five million, five hundred sixty-one thousand, five hundred fifty-one".