42750551 has 4 divisors (see below), whose sum is σ = 45000600. Its totient is φ = 40500504.

The previous prime is 42750541. The next prime is 42750559. The reversal of 42750551 is 15505724.

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

It is a cyclic number.

It is not a de Polignac number, because 42750551 - 2²² = 38556247 is a prime.

It is a super-2 number, since 2×42750551² = 3655219221607202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42750559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1124996 + ... + 1125033.

It is an arithmetic number, because the mean of its divisors is an integer number (11250150).

Almost surely, 2^42750551 is an apocalyptic number.

42750551 is a deficient number, since it is larger than the sum of its proper divisors (2250049).

42750551 is a wasteful number, since it uses less digits than its factorization.

42750551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2250048.

The product of its (nonzero) digits is 7000, while the sum is 29.

The square root of 42750551 is about 6538.3905511984. The cubic root of 42750551 is about 349.6610350935.

The spelling of 42750551 in words is "forty-two million, seven hundred fifty thousand, five hundred fifty-one".