1358628261 has 4 divisors (see below), whose sum is σ = 1811504352. Its totient is φ = 905752172.

The previous prime is 1358628259. The next prime is 1358628277. The reversal of 1358628261 is 1628268531.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1628268531 = 3 ⋅542756177.

It is a cyclic number.

It is not a de Polignac number, because 1358628261 - 2¹ = 1358628259 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1358628241) 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, 226438041 + ... + 226438046.

It is an arithmetic number, because the mean of its divisors is an integer number (452876088).

Almost surely, 2^1358628261 is an apocalyptic number.

It is an amenable number.

1358628261 is a deficient number, since it is larger than the sum of its proper divisors (452876091).

1358628261 is an equidigital number, since it uses as much as digits as its factorization.

1358628261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452876090.

The product of its digits is 138240, while the sum is 42.

The square root of 1358628261 is about 36859.5748890299. The cubic root of 1358628261 is about 1107.5590277449.

The spelling of 1358628261 in words is "one billion, three hundred fifty-eight million, six hundred twenty-eight thousand, two hundred sixty-one".