1351999898 has 4 divisors (see below), whose sum is σ = 2027999850. Its totient is φ = 675999948.

The previous prime is 1351999897. The next prime is 1351999951. The reversal of 1351999898 is 8989991531.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1068178489 + 283821409 = 32683^2 + 16847^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1351999898.

It is not an unprimeable number, because it can be changed into a prime (1351999897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 337999973 + ... + 337999976.

Almost surely, 2^1351999898 is an apocalyptic number.

1351999898 is a deficient number, since it is larger than the sum of its proper divisors (675999952).

1351999898 is an equidigital number, since it uses as much as digits as its factorization.

1351999898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675999951.

The product of its digits is 6298560, while the sum is 62.

The square root of 1351999898 is about 36769.5512346833. The cubic root of 1351999898 is about 1105.7549349283.

The spelling of 1351999898 in words is "one billion, three hundred fifty-one million, nine hundred ninety-nine thousand, eight hundred ninety-eight".