1901642061 has 16 divisors (see below), whose sum is σ = 2804986368. Its totient is φ = 1136276400.

The previous prime is 1901642053. The next prime is 1901642069. The reversal of 1901642061 is 1602461091.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1901642053) and next prime (1901642069).

It is not a de Polignac number, because 1901642061 - 2³ = 1901642053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1901642069) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 403471 + ... + 408156.

It is an arithmetic number, because the mean of its divisors is an integer number (175311648).

Almost surely, 2^1901642061 is an apocalyptic number.

1901642061 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1901642061 is a deficient number, since it is larger than the sum of its proper divisors (903344307).

1901642061 is a wasteful number, since it uses less digits than its factorization.

1901642061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811712.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 1901642061 is about 43607.8210989726. The cubic root of 1901642061 is about 1238.9190330129.

The spelling of 1901642061 in words is "one billion, nine hundred one million, six hundred forty-two thousand, sixty-one".