42651551 has 2 divisors, whose sum is σ = 42651552. Its totient is φ = 42651550.

The previous prime is 42651529. The next prime is 42651569. The reversal of 42651551 is 15515624.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42651551 - 2¹⁰ = 42650527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42651151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21325775 + 21325776.

It is an arithmetic number, because the mean of its divisors is an integer number (21325776).

Almost surely, 2^42651551 is an apocalyptic number.

42651551 is a deficient number, since it is larger than the sum of its proper divisors (1).

42651551 is an equidigital number, since it uses as much as digits as its factorization.

42651551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6000, while the sum is 29.

The square root of 42651551 is about 6530.8154927237. The cubic root of 42651551 is about 349.3909161733.

The spelling of 42651551 in words is "forty-two million, six hundred fifty-one thousand, five hundred fifty-one".