1254755821 has 4 divisors (see below), whose sum is σ = 1368824544. Its totient is φ = 1140687100.

The previous prime is 1254755743. The next prime is 1254755837. The reversal of 1254755821 is 1285574521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1254755821 - 2¹⁵ = 1254723053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1254755221) 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, 57034345 + ... + 57034366.

It is an arithmetic number, because the mean of its divisors is an integer number (342206136).

Almost surely, 2^1254755821 is an apocalyptic number.

1254755821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1254755821 is a deficient number, since it is larger than the sum of its proper divisors (114068723).

1254755821 is a wasteful number, since it uses less digits than its factorization.

1254755821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114068722.

The product of its digits is 112000, while the sum is 40.

The square root of 1254755821 is about 35422.5326734270. The cubic root of 1254755821 is about 1078.5817635270.

The spelling of 1254755821 in words is "one billion, two hundred fifty-four million, seven hundred fifty-five thousand, eight hundred twenty-one".