1902121961 has 8 divisors (see below), whose sum is σ = 1907705184. Its totient is φ = 1896547680.

The previous prime is 1902121951. The next prime is 1902121967. The reversal of 1902121961 is 1691212091.

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 1902121961 - 2¹⁴ = 1902105577 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1902121967) 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, 725525 + ... + 728141.

It is an arithmetic number, because the mean of its divisors is an integer number (238463148).

Almost surely, 2^1902121961 is an apocalyptic number.

It is an amenable number.

1902121961 is a deficient number, since it is larger than the sum of its proper divisors (5583223).

1902121961 is a wasteful number, since it uses less digits than its factorization.

1902121961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4471.

The product of its (nonzero) digits is 1944, while the sum is 32.

The square root of 1902121961 is about 43613.3232051858. The cubic root of 1902121961 is about 1239.0232424658.

The spelling of 1902121961 in words is "one billion, nine hundred two million, one hundred twenty-one thousand, nine hundred sixty-one".