351651997 has 4 divisors (see below), whose sum is σ = 351727420. Its totient is φ = 351576576.

The previous prime is 351651961. The next prime is 351652009. The reversal of 351651997 is 799156153.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 799156153 = 11549 ⋅69197.

It can be written as a sum of positive squares in 2 ways, for example, as 148133241 + 203518756 = 12171^2 + 14266^2 .

It is a cyclic number.

It is not a de Polignac number, because 351651997 - 2¹⁹ = 351127709 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 (351651907) 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, 30222 + ... + 40207.

It is an arithmetic number, because the mean of its divisors is an integer number (87931855).

Almost surely, 2^351651997 is an apocalyptic number.

It is an amenable number.

351651997 is a deficient number, since it is larger than the sum of its proper divisors (75423).

351651997 is an equidigital number, since it uses as much as digits as its factorization.

351651997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75422.

The product of its digits is 255150, while the sum is 46.

The square root of 351651997 is about 18752.3864347981. The cubic root of 351651997 is about 705.8369062872.

The spelling of 351651997 in words is "three hundred fifty-one million, six hundred fifty-one thousand, nine hundred ninety-seven".