1210995997 has 4 divisors (see below), whose sum is σ = 1250060416. Its totient is φ = 1171931580.

The previous prime is 1210995983. The next prime is 1210996001. The reversal of 1210995997 is 7995990121.

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.

It is a cyclic number.

It is not a de Polignac number, because 1210995997 - 2⁷ = 1210995869 is a prime.

It is a super-2 number, since 2×1210995997² = 2933022609500048018, 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 (1210795997) 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, 19532163 + ... + 19532224.

It is an arithmetic number, because the mean of its divisors is an integer number (312515104).

Almost surely, 2^1210995997 is an apocalyptic number.

It is an amenable number.

1210995997 is a deficient number, since it is larger than the sum of its proper divisors (39064419).

1210995997 is an equidigital number, since it uses as much as digits as its factorization.

1210995997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39064418.

The product of its (nonzero) digits is 459270, while the sum is 52.

The square root of 1210995997 is about 34799.3677672454. The cubic root of 1210995997 is about 1065.8945358176.

The spelling of 1210995997 in words is "one billion, two hundred ten million, nine hundred ninety-five thousand, nine hundred ninety-seven".