1245055551 has 8 divisors (see below), whose sum is σ = 1671068544. Its totient is φ = 824539800.

The previous prime is 1245055543. The next prime is 1245055577. The reversal of 1245055551 is 1555505421.

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

It is not a de Polignac number, because 1245055551 - 2³ = 1245055543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245055151) 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, 1373781 + ... + 1374686.

It is an arithmetic number, because the mean of its divisors is an integer number (208883568).

Almost surely, 2^1245055551 is an apocalyptic number.

1245055551 is a deficient number, since it is larger than the sum of its proper divisors (426012993).

1245055551 is a wasteful number, since it uses less digits than its factorization.

1245055551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2748621.

The product of its (nonzero) digits is 25000, while the sum is 33.

The square root of 1245055551 is about 35285.3447056990. The cubic root of 1245055551 is about 1075.7951358270.

The spelling of 1245055551 in words is "one billion, two hundred forty-five million, fifty-five thousand, five hundred fifty-one".