1258778051 has 4 divisors (see below), whose sum is σ = 1265368704. Its totient is φ = 1252187400.

The previous prime is 1258778047. The next prime is 1258778069. The reversal of 1258778051 is 1508778521.

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 1258778051 - 2² = 1258778047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1258777993 and 1258778011.

It is not an unprimeable number, because it can be changed into a prime (1258778011) 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, 3295040 + ... + 3295421.

It is an arithmetic number, because the mean of its divisors is an integer number (316342176).

Almost surely, 2^1258778051 is an apocalyptic number.

1258778051 is a deficient number, since it is larger than the sum of its proper divisors (6590653).

1258778051 is an equidigital number, since it uses as much as digits as its factorization.

1258778051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6590652.

The product of its (nonzero) digits is 156800, while the sum is 44.

The square root of 1258778051 is about 35479.2622668510. The cubic root of 1258778051 is about 1079.7330304342.

The spelling of 1258778051 in words is "one billion, two hundred fifty-eight million, seven hundred seventy-eight thousand, fifty-one".