1253606991 has 32 divisors (see below), whose sum is σ = 2060610048. Its totient is φ = 660147840.

The previous prime is 1253606969. The next prime is 1253606999. The reversal of 1253606991 is 1996063521.

It is not a de Polignac number, because 1253606991 - 2¹⁹ = 1253082703 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1253606999) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 176980 + ... + 183926.

It is an arithmetic number, because the mean of its divisors is an integer number (64394064).

Almost surely, 2^1253606991 is an apocalyptic number.

1253606991 is a deficient number, since it is larger than the sum of its proper divisors (807003057).

1253606991 is a wasteful number, since it uses less digits than its factorization.

1253606991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7631.

The product of its (nonzero) digits is 87480, while the sum is 42.

The square root of 1253606991 is about 35406.3128693175. The cubic root of 1253606991 is about 1078.2524868591.

The spelling of 1253606991 in words is "one billion, two hundred fifty-three million, six hundred six thousand, nine hundred ninety-one".