2151507394 has 4 divisors (see below), whose sum is σ = 3227261094. Its totient is φ = 1075753696.

The previous prime is 2151507383. The next prime is 2151507439. The reversal of 2151507394 is 4937051512.

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., 1586827225 + 564680169 = 39835^2 + 23763^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 537876847 + ... + 537876850.

Almost surely, 2^2151507394 is an apocalyptic number.

2151507394 is a deficient number, since it is larger than the sum of its proper divisors (1075753700).

2151507394 is a wasteful number, since it uses less digits than its factorization.

2151507394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1075753699.

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 2151507394 is about 46384.3442769217. The cubic root of 2151507394 is about 1290.9644439265.

It can be divided in two parts, 2151 and 507394, that added together give a triangular number (509545 = T₁₀₀₉).

The spelling of 2151507394 in words is "two billion, one hundred fifty-one million, five hundred seven thousand, three hundred ninety-four".