1391961253 has 8 divisors (see below), whose sum is σ = 1401730848. Its totient is φ = 1382226384.

The previous prime is 1391961239. The next prime is 1391961301. The reversal of 1391961253 is 3521691931.

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

It is a cyclic number.

It is not a de Polignac number, because 1391961253 - 2⁹ = 1391960741 is a prime.

It is a super-2 number, since 2×1391961253² = 3875112259706660018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391961653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74526 + ... + 91312.

It is an arithmetic number, because the mean of its divisors is an integer number (175216356).

Almost surely, 2^1391961253 is an apocalyptic number.

It is an amenable number.

1391961253 is a deficient number, since it is larger than the sum of its proper divisors (9769595).

1391961253 is a wasteful number, since it uses less digits than its factorization.

1391961253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17363.

The product of its digits is 43740, while the sum is 40.

The square root of 1391961253 is about 37308.9969444369. The cubic root of 1391961253 is about 1116.5436742932.

The spelling of 1391961253 in words is "one billion, three hundred ninety-one million, nine hundred sixty-one thousand, two hundred fifty-three".