1245242551 has 8 divisors (see below), whose sum is σ = 1425507104. Its totient is φ = 1065571200.

The previous prime is 1245242527. The next prime is 1245242573. The reversal of 1245242551 is 1552425421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1245242551 - 2⁷ = 1245242423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245242591) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143790 + ... + 152203.

It is an arithmetic number, because the mean of its divisors is an integer number (178188388).

Almost surely, 2^1245242551 is an apocalyptic number.

1245242551 is a deficient number, since it is larger than the sum of its proper divisors (180264553).

1245242551 is an equidigital number, since it uses as much as digits as its factorization.

1245242551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296601.

The product of its digits is 16000, while the sum is 31.

The square root of 1245242551 is about 35287.9944315344. The cubic root of 1245242551 is about 1075.8489924921.

Adding to 1245242551 its reverse (1552425421), we get a palindrome (2797667972).

The spelling of 1245242551 in words is "one billion, two hundred forty-five million, two hundred forty-two thousand, five hundred fifty-one".