1258126261 has 4 divisors (see below), whose sum is σ = 1437858592. Its totient is φ = 1078393932.

The previous prime is 1258126253. The next prime is 1258126283. The reversal of 1258126261 is 1626218521.

It is a happy number.

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: 1626218521 = 17 ⋅95659913.

It is not a de Polignac number, because 1258126261 - 2³ = 1258126253 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 (1258126231) 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, 89866155 + ... + 89866168.

It is an arithmetic number, because the mean of its divisors is an integer number (359464648).

Almost surely, 2^1258126261 is an apocalyptic number.

It is an amenable number.

1258126261 is a deficient number, since it is larger than the sum of its proper divisors (179732331).

1258126261 is an equidigital number, since it uses as much as digits as its factorization.

1258126261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179732330.

The product of its digits is 11520, while the sum is 34.

The square root of 1258126261 is about 35470.0755708245. The cubic root of 1258126261 is about 1079.5466378465.

The spelling of 1258126261 in words is "one billion, two hundred fifty-eight million, one hundred twenty-six thousand, two hundred sixty-one".