1901134821 has 8 divisors (see below), whose sum is σ = 2545453440. Its totient is φ = 1262119712.

The previous prime is 1901134801. The next prime is 1901134843. The reversal of 1901134821 is 1284311091.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1901134821 - 2⁵ = 1901134789 is a prime.

It is a super-2 number, since 2×1901134821² = 7228627215237404082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1901134801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1325040 + ... + 1326473.

It is an arithmetic number, because the mean of its divisors is an integer number (318181680).

Almost surely, 2^1901134821 is an apocalyptic number.

It is an amenable number.

1901134821 is a deficient number, since it is larger than the sum of its proper divisors (644318619).

1901134821 is a wasteful number, since it uses less digits than its factorization.

1901134821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2651755.

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 1901134821 is about 43602.0047818905. The cubic root of 1901134821 is about 1238.8088676656.

The spelling of 1901134821 in words is "one billion, nine hundred one million, one hundred thirty-four thousand, eight hundred twenty-one".